I agree you're probably hearing about them more because of violent crimes, I feel they really sort of came more into the spotlight after that man in Toronto attacked women with his van, I mean an event like that is very newsworthy and you're going to get information on his background and motives, which brings to light groups he's connected with.
I've read before how incels are sort of a hijacked group, I heard they started out as a niche online dating forum for both men and women who've had difficulty with relationships, but from what I understand it got sort of taken over by men who are angry. I feel incels, men's rights activists, men going their own way, and such are all similar at their core because they all blame women for their problems, and lament how women's progress and liberation has caused harm to traditional male dominance and privilege, and honestly all those extremists frighten me. My feeling is incels would love to see women enslaved (I've heard things like some Canadian writer whose name I forget believes women should be forced into monogamous relationships), and others probably wouldn't agree with them, like from what I understand mgtow have their feelings because they believe women are evil and have too many rights and aren't worth relationships because we can't be controlled.
But anyways I'm sorry, I do feel you'd hear more about those other groups if members started carrying out violence, or have celebrity spokesmen or something. I mean, there are many sects and cults you don't hear much about because they just don't do anything newsworthy (subjugation of women is a very common theme I believe you'll find though.)