If a queer space is able to accept cis-het people, that means it can accept closeted and cishet passing queer people, as well as people who are queer and don't know it.
There's also other reasons but if you only care about queer people then this is as good of a reason as any.
This is also a notable thing I like about the furry fandom. It's a majority queer community, but because you only need to like anthropamorphic animals to be considered part of it, it has no reason to reject cishet people, unlike some queer groups. (at least in my experience).