NotMeNotYou said:
The answer "why" is at https://e621.net/forum/show/195122. This is also something that was said in the official statement, just not as blunt.

I mean, image what is going to happen if someone runs crying to the merchant processor yelling about people using their service for CP. This is not going to be a risk any sane person will take when there is an entire website at stake; especially with how "willing" people are to investigate something like this.

Hate to say it, but basically this. It's like a person at a party/large gathering of some kind screaming rape, all factors of due process are ejected and the accused are automatically guilty. By the time anyone bothers to actually look into matters the person's life is already ruined/the establishment already got burned to the ground.

This sadly isn't an issue that can be battled, or argued to a compromise. This goes past furry drama and into longstanding social/moral biases. The "pro cub" side lost the moment that artist posted the ticket and rallied support for their side.