I think we'll all be surprised by who ends up on each side when the curtain is pulled up. Q didn't name names, but it's clear that many people had been trapped in the evil system and were only there because they or loved ones would be killed if they left and their efforts by themselves without Q would have been fruitless.

By giving them a way out, Q captured many assets from the BH. And flipping overtly would have diminished their effectiveness, and their ability to flip others up and down the chain. Time will tell.