I really don’t like that simply drawing a certain arrangement of lines and colors is now a crime

I’m sorry to break it to you, but this has been illegal for a long time and it doesn’t need to have anything to do with CSAM.

For instance, drawing certain copyrighted material in certain contexts can be illegal.

To go even further, numbers and maths can be illegal in the right circumstances. For instance, it may be illegal where you live to break the encryption of a certain file, depending on the file and encryption in question (e.g. DRM on copyrighted material). “Breaking the encryption of a file” essentially translates to “doing maths on a number” when you boil it down. That’s how you can end up with the concept of illegal numbers.