Sounds about right to me. I once thought it would maybe help me get a job. It just let users, especially head hunters contact you requesting to join your group and harvesting it for their own purposes. Good idea once now totally abused and so much spam and garbage from people that know so little.
They get free training data from users to make the models better. Worse, it seems like content that slips past human 'AI slop' detection gets rewarded more, which just pushes people to write more convincingly fake stuff.