Banned @Usernames
Found a way to exclude unwanted names for registration. If I'm wrong, I'll be glad if you correct me.
You need to manually create users in WordPress with the names admin, boss, support, etc., as well as with names consisting of regative/swear words. Then such names will not be available for registration of regular users in FluentCommunity, but they will not be visible in the list of participants.
Best answer from Aaron Liang
There is already a list of usernames reserved for admins only. See this comment. However, they haven't implemented a UI for us to modify the list yet.
There are some other things you can do. Here's an article that mentions a plugin to restrict usernames and disabling nicknames.
https://wpmudev.com/blog/how-to-restrict-usernames-and-disable-nicknames-in-wordpress/
William Beem Thanks! Is it compatible with FluentCommunity?
There is already a list of usernames reserved for admins only. See this comment. However, they haven't implemented a UI for us to modify the list yet.
Aaron Liang thank you for your wonderful reply!