Well, you can, obviously, promote a bunch of pawns, but it seems like it would only be enjoyable if you were sadistic to some degree. I don't really find it interesting to embarrass my opponent because their pain isn't my pleasure. I just want to play well. That, by the way, can involve crushing the opponent, but crushing just for the sake of crushing I don't see the need.
I guess if you think playing on is immoral this is your payback, so it may partially depend on one's views on the etiquette of playing on.
no