You're more than welcome to create any communities you like. The theme of queer folk and allies is for members of the instance, not on what they in turn talk about. The goal is to have a place where queer folk can exist safely. That doesn't mean only talking about queer stuff though :)
Also is there a way to donate to blahaj.zone server costs? I didn’t see anything under /about but I just thought I’d ask!
Not yet, but it's coming