This is different because, to a certain extent, people in the public eye can expect, anticipate, and react to/suppress this kind of thing. They have managers and PR people who can help them handle it in a way that doesn’t negatively affect them. Billy’s 13 year old classmate Stacy doesn’t have those resources and now he can do the same thing to her. It’s on a very different level of harm.
Clip Studio Paint has mostly taken over the small time/independent illustration industry, unless you’ve got an ipad and use procreate. Krita seems ok, too, though after testing both briefly I preferred CSP.