One of the rehomed ones went for my dog this morning (I'm in Scotland).
The owner, who was maybe 18/19, had it on a lead it started yanking at the lead snarlinabandoned snapping at my pup, the owner could barely control it, this is despite me moving away before it even approached because my puppy gets over excited around other dogs. He shouted that it's OK, the dog is a rescue and managed to pull it away. I waited 5 minutes, continued on the walk, them spotted the owner taking the dog off lead, so I changed direction and went elsewhere.
I know a couple of people with XL bullys, and they are lovely and well trained. The problem is a bunch of strangers have given another bunch of strangers a bunch of strange dogs. Nobody has checked anything from either side. Its a disaster waiting to happen.