I wouldn't be so sure.
I mean do you honestly think Kid Briton was at Braddock Academy for being a 'good guy'? Hell, no. He was there because our Brian Braddock knew that this kid version of himself was going to have all that power but none of the morale fibre to use it properly. We're told his dimension collapsed in some fashion. How do we know Kid Briton didn't in some way even cause that to happen?
Anyway, my point is that he was on the roster for a similar reason to why the original Avengers Academy kids were taken on. Because of the genuine threat they could become if left to their own devices.
I wouldn't be surprised if to some degree Apex was considered similarly. She's got potential super-villain written all over her.