From what I've seen, there's very little people on Potterworld who have been rude or disrespectful regarding pronouns or LGBTQ+ related topics in general. I understand what you mean by it being able to be easily abused, but based on my experience, the community that Potterworld harbors seems to be very accepting and respectful of others (pronouns and identities). I haven't met anyone there who's been that way to me or others, but that's just me personally. And correct me if I'm wrong, but I imagine weeding out the disrespectful ones would be very easy considering how little of them there are. Obviously, there's a lot of pronouns, but people still need a space where they can safely use their pronouns. The people who use they/them pronouns (like myself) and/or neopronouns still deserve a place to be respected in that aspect.