I think that a few that have messaged me like 'oh, you're bi too uwu?' are catfishes in that they either are female and just aren't the girls in their pictures, or they're guys looking to get off with their girl on girl fantasies, but I would hope that most of us are genuine.
It depends a lot of younger girls would not have a fixed definition of their sexuality - I would be wary and look for other signs of catfishes but I know a few girls who class themselves as bi that said they might be 95% straight but they are genuine.
There are a few female users who have sent me flirty messages who are using fake pictures. One I know for a fact is a dude, but the others I don't know about. It is tempting just to write them off as men but in my experience it's more often younger girls posing as older girls. Like, young teenagers. So exercise caution.
There is a user who is always signing up with some variation of the name 'lesbian femme' who is always deleted within a few days and I don't know why but I can only guess it's due to inappropriate messages.
There are a lot more real-deal gay girls on here than ever before though, so don't worry too much :3