I think in general we just need more people.. There are communities that exist in Lemmy which are basically empty / inactive that used to be active in Reddit (i.e. Datatabases, Postgresql, FreeBSD subreddits). Perhaps as more people discover Lemmy those smaller / niche communities will see more traffic.
I can't even think of any valid reason why Udemy would need GenAI. Closed my account. This is the type of behavior I will not accept from a company. If enough people stood up to the Reddit's and Udemy's of the world they may, ... maybe, be more responsible towards their users and their partners (in this case the people posting courses in Udemy).