Polyamory is a magnet for abusive and toxic men. We’re talking about isolating you from friend groups if you don’t do what they want, huge age gap relationships, unicorn hunting, lying, pressuring you into doing things you don’t want to do, metas trying to remove you from the picture out of jealousy, etc… If you want a polycule, it’s likely going to be taken from you if you break up with anyone from it. Your support group, entirely gone overnight.
People into polyamory have this very stressful lifestyle all based around using people, swinging from one branch to the next for the thrill of it. Thrill-seekers are people who have never touched the ground long enough to appreciate the simple peace of stability. They don't form those secure relationships. They want a thin grasp on several at once instead of a firm grasp on one, because thin grasps and superficiality is all they've ever known.
I'd also add it's almost impossible to do 'ethically' and have room in your life for things such as gainful employment, non-sexual friendships, exercise, hobbies, family, travel etc etc etc
People I know who are still into it have to devote their whole life to it and are constantly in some horrible emotional drama.
Or they trye to remove the emotions from it. And then what are they left with? Emotionally barren, addictive thrill seeking.
Not good, not good, not good.