As someone who owns a couple lock picks and plays around with em, let me tell you, knowing how to do it does not make it easy. Info about how to pick locks is easily obtained elsewhere, and honestly his videos aren’t exactly helpful in an instructional way. I really doubt he’s had a large effect on criminals using lockpicks, especially when it’s so much easier to most to cut them with bolt cutters. What I would say he has had more of an impact on is people using more secure locks than masterlocks. I suspect he’s had a net benefit on security. I dunno, not like I know the statistics or anything, I think it’s a fair estimate though.