Re: Users don’t see rich text editor
This isn’t a BuddyPress issue as the rich editing options and settings are handled through WordPress MU.
From what I could see on a quick search on https://mu.wordpress.org/forums/, the rich editor options will only affect new blogs (not ones already created). For older ones, you might have to manually update the setting in the database with a tool such as phpMyAdmin.
I’d suggest also digging around more in the MU forums for such terms as “rich editor” or “rich editing” to see if there are more threads on this topic.