I don't really get the whole mittens thing. Chess engines have been better than humans for a long time, and they've been on chess.com forever. I guess the joke of giving it rating of 1 when it is playing at a very high level and a cute picture is good marketing. But getting beaten by an engine isn't particularly fun. It isn't really educational either when it is so much better than you.
I think it's also that Mittens has a bias towards very aggressive rather than strictly optimal play?