Bots here have very weird ratings. I would guess most humans play them in casual mode. It would be better if the rating of the engine would still change but not the humans.
No, because sometimes a bot would want his rating to be unaffected too. As an example, my bot plays much weaker in Casual. Just get used to this weird ratings, because humans don't really like playing with bots.
The BOT rating distribution is weird although I don't see abuse-proof ways to improve on the current situation.
@high_five Well it could be optional
There are people who play might play much weaker when it's just a casual game. Then the bot's rating gain won't be fair.