Based on my experience, and was thinking of it while returning from the conference! Why I arrived to this point, I was always respecting people, but probably there are advisor who dont like to see their students grow and shine, we are human being, even myself, sometimes I feel jealous but what retracts me from hurting people is conscience!
Honestly, me and many students will tell you that at the first couple months, you will see an angel PI and you will not recognize their behavior unless you go with the time! This PI was trying to looks like a cool and funny person, but I didn't know about their dreadful actions towards the senior student who was not allowed to defend his PhD although publishing in top-tier conferences which is a big question mark! My fault is not asking the students before joining, however, some students afraid to tell the truth because they could endanger them, another thing, there aren't alumni listed in the website which I see after my experience is a red flag. The good PI will be proud to put links about their PI and where they have arrived.
I do think even if you made a good relationship with your PI as probably I had the beginning, but when he realized that I want to publish and attend conferences, he felt jealous. With a reference to that I began to realize that he don't want any one to be successful, the toxic PI feels happy when people are desperate and they get their power from the weakness of others.
He was trying to suppress me from presenting my work although he doubted and forced me to leave and now he wants to put his name on my proposed methodology which is insane!
There are two roads to continue under psycho PI or leave it , and from my position after spending one year, I can say I am totally damaged mentally and physically as well, and it is not easy at all!
All the students want to learn and do research that they are passionate about . In the other side, the abusive PI is going to fabricate problems and make obstacles for the students to stumble their progress.
I dont know what could be the solution as I read stories from more than one decade and still the problem exists. That is made me wondering, whether academia is fake and fabricating non-existing problems to finds solutions, I dont know that makes me contemplating about academia.