It might seem worthwhile have bot games be not be rated. There are ways to win against a bot that are just utilizing some blind spot/glitch. The false wins will throw off rankings/ratings for the person exploiting and have ripple effects on others rankings/ratings that they have played.
See for example:
We all know newer bots such as LeelaZero, KataGo, etc. are beyond humans and there seems to be little gained by having them effect rankings/ratings.