BuddyPress.org

Then as nexia mentioned above, that is a custom job. BP is network-activated i.e. by default for all sites of a multisite installation.

One way you can prevent BP in main site or secondary site from importing data from all sites is by marking e.g. My Blog in Settings > Permalnks – “I would like to block search engines, but allow normal visitors” or even choose additional options with https://wordpress.org/extend/plugins/more-privacy-options/