It had too high of an influence to integrity ratio, and got infiltrated by motivated actors. That is not an uncommon dynamic. Every democratic forum kind of medium with significance becomes a target for career propagandists and con artists and so on.
Well, I’d say they blatantly sold out all by themselves long before it was infiltrated by anybody, but communities can weather that. The proto incels turning it into a wannabe 4 Chan troll tank with zero intervention alienated everyone that considered a high concentration of Neo nazis a dealbreaker… so pretty much anybody that actually worked in tech rather than basement dwellers whose computer was the only animated object that still communicated with them.