thedreadvampy
Daniel Radcliffe for sure IS a vocal trans ally and that's in and of itself a good reason to not want to be involved in anything to do with Harry Potter. He's done a huge amount of advocacy work and fundraising to support LGBTQ youth for most of his public life, well before Rowling came out of the transphobia closet - this fucking matters to him.
but I also think it's worth acknowledging that although he's pretty positive and diplomatic about his experience with the Harry Potter series, he's been extremely clear since the last film came out that he has no interest in coming back to the role, and while it's a bit dodgy to speculate about people's lives here, he's talked about how he had a pretty severe alcoholism issue towards the back end of the films, as a coping mechanism for the scrutiny that he was under. He's said that there are big chunks of the latter films where he's visibly still drunk. I think it's safe to assume that Harry Potter represents a time in his life he's not necessarily keen to revisit, and that's also a pretty reasonable thing imo.