LAUREN | DAISY
The tech isn't perfect. They send the coins out into the multiverse, but free will is a thing and they can't really control who does or doesn't pick 'em up. Sometimes that means we end up with some bad guys here.
For the dangerous was, they have tools to minimize their ability to hurt anyone. They let them stay, but they put them on a kind of probation, dampen any powers they might have, stuff like that.