BuddyPress.org

On the other hand spammers bypass even the required fields of the registration form and get registered. What should I do?

well I was trying post the my code, but I think I spammed myself after trying to edit the reply to this …
CPT (and custom title thing)

add_action('init', 'video_register_my_cpt');
function video_register_my_cpt() {
register_post_type('video', array( 
'label' => 'Videos',
'description' => 'Latest Videos',
'public' => true,
'show_ui' => true,
'show_in_menu' => true,
'menu_position' => 5,
 'show_in_nav_menus' => false,
'capability_type' => 'post',
'hierarchical' => false,
'rewrite' => array('slug' => 'videos'),
'query_var' => true,
'has_archive' => true,
'exclude_from_search' => false,
'supports' => array('title','editor','excerpt','trackbacks','custom-fields','comments','revisions','thumbnail','author','page-attributes','buddypress-activity'), 
'bp_activity' => array(
            'component_id' => buddypress()->blogs->id,
            'action_id'    => 'new_video',
            'format_callback' => 'bp_blogs_format_activity_action_new_blog_post',
            'comment_action_id' => 'new_video_comment',
            'comment_format_callback' => 'bp_activity_format_activity_action_custom_post_type_comment',
            'contexts'     => array( 'activity', 'member' ),
            'position'     => 40,
            ),
  'taxonomies' => array('video_category','video_tag'),
  'labels' => array(
  'name' => 'Videos',
  'singular_name' => 'Video',
  'menu_name' => 'Videos',
  'add_new' => 'Add Video',
  'add_new_item' => 'Add New Video',
  'edit' => 'Edit',
  'edit_item' => 'Edit Video',
  'new_item' => 'New Video',
  'view' => 'View Video',
  'view_item' => 'View Video',
  'search_items' => 'Search Videos',
  'not_found' => 'No Videos Found',
  'not_found_in_trash' => 'No Videos Found in Trash',
            
            'bp_activity_admin_filter' => __( 'New video published', 'custom-domain' ),
            'bp_activity_front_filter' => __( 'Videos', 'custom-domain' ),
            'bp_activity_new_post'     => __( '%1$s added <a href="%2$s">[Video]</a>', 'custom-domain' ),
            'bp_activity_new_post_ms'  => __( '%1$s added <a href="%2$s">[Video]</a>','custom-domain' ),
            
            'bp_activity_comments_admin_filter' => __( 'Comments about video', 'custom-domain' ), // label for the Admin dropdown filter
            'bp_activity_comments_front_filter' => __( 'Video Comments', 'custom-domain' ),        // label for the Front dropdown filter
            'bp_activity_new_comment'           => __( '%1$s commented on a <a href="%2$s">video</a>', 'custom-domain' ),
            'bp_activity_new_comment_ms'        => __( '%1$s commented on a <a href="%2$s">[Video]</a>, on the site %3$s', 'custom-domain' )

  )

) ); }

function my_video_include_post_type_title( $action, $activity ) {
  if ( empty( $activity->id ) ) {
    return $action;
  }

  if ( 'new_video' != $activity->type && 'new_video_comment' !=$activity->type ) {
    return $action;
  }

  preg_match_all( '/<a.*?>([^>]*)<\/a>/', $action, $matches );

  if ( empty( $matches[1][1] ) || '[Video]' != $matches[1][1] ) {
    return $action;
  }

  $post_type_title = bp_activity_get_meta( $activity->id, 'post_title' );

  if ( empty( $post_type_title ) ) {

    switch_to_blog( $activity->item_id );

    $post_type_title = get_post_field( 'post_title', $activity->secondary_item_id );

    // We have a title save it in activity meta to avoid switching blogs too much
    if ( ! empty( $post_type_title ) ) {
      bp_activity_update_meta( $activity->id, 'post_title', $post_type_title );
    }

    restore_current_blog();
  }

  return str_replace( $matches[1][1], esc_html( $post_type_title ), $action );
}
add_filter( 'bp_activity_custom_post_type_post_action', 'my_video_include_post_type_title', 10, 2 );

BP CUSTOM

/*////////////////////////////////////////////////////////////////////////////////////////////*/
// Modifying CPT Activity Actions
/*///////////////////////////////////////////////////////////////////////////////////////////*/

function record_blogpost_activity_action( $activity_action, $post, $post_permalink ) {
global $bp;

if( $post->post_type == 'jobs' || get_post_type($post->ID) == 'jobs' ) {
  
  $activity_action  = sprintf( __( '%1$s', 'buddypress' ), bp_core_get_userlink( (int) $post->post_author ), '<a href="' . $post_permalink . '">' . $post->post_title . '</a>');

} elseif( $post->post_type == 'video' || get_post_type($post->ID) == 'video' ) {

  $activity_action  = sprintf( __( '%1$s posted a video', 'buddypress' ), bp_core_get_userlink( (int) $post->post_author ), '<a href="' . $post_permalink . '">' . $post->post_title . '</a>' );

} elseif($post->post_type == 'post'  ) {

  $activity_action  = sprintf( __( '%1$s posted a blog', 'buddypress' ), bp_core_get_userlink( (int) $post->post_author ), '<a href="' . $post_permalink . '">' . $post->post_title . '</a>' );

}  

return $activity_action;
}

add_filter('bp_blogs_activity_new_post_action', 'record_blogpost_activity_action', 11, 3);

/*////////////////////////////////////////////////////////////////////////////////////////////*/
// Modifying CPT Comment Activity Actions
/*///////////////////////////////////////////////////////////////////////////////////////////*/

function comment_activity_action( $activity_action, $post, $post_permalink ) {
global $bp;
if( $post->post_type == 'post' ) {

  $activity_action  = sprintf( __( '%1$s commented on %2$s', 'buddypress' ), bp_core_get_userlink( (int) $post->post_author ), '<a href="' . $post_permalink . '">' . $post->post_title . '</a>' );

} elseif( $post->post_type == 'video' || get_post_type($post->ID) == 'video' ) {

  $activity_action = sprintf( __( '%1$s replied on the video %2$s', 'buddypress' ), bp_core_get_userlink( (int) $post->post_author ), '<a href="' . esc_url( $post_permalink ). '">' . $post->post_title . '</a>' );

} 
return $activity_action;

}

add_filter('bp_blogs_activity_new_comment_action', 'comment_activity_action', 11, 3);

/*//// ? /////*/
function bbg_record_video_post_type_comments( $post_types ) {
      $post_types[] = 'video';
      return $post_types;
  }
//add_filter( 'bp_blogs_record_post_post_types', 'bbg_record_video_post_type_comments' );
//add_filter( 'bp_blogs_record_comment_post_types', 'bbg_record_video_post_type_comments' );

doing it this way, everything works except my custom comment action.

No. They are not in spam. My coworker contacted WPMU dev support and they seemed to not be able to send BuddyPress emails either. WordPress emails work, i.e. forgot password and registration through wordpress works.

https://premium.wpmudev.org/forums/topic/buddypress-emails-are-not-working