[miso]

You can file a copyright claim on the videos that were stolen, since he used your videos without your consent.

true, btw, if he tries to pass it as fair use, you can easily proove that he didn't give any criticism towards things that you own, such as the wesbite

TL;DR: you can fuck him up easily, you can technically strike other of his videos if he does the same on others, remember, 3 strikes will get his channel deleted (don't try to false copyright strike, make sure the video has enough evidence to make him get a strike)