I don't think anyone is into that sort of thing

You're a prude, many people enjoy this, you can find people on fetish sites that are into anal fisting and even more extreme things. They hook up and do these kinds of things off camera.

I think its a bunch of largely scummy dudes in LA figuring out how many fucked up things they can get abused young women to do.

She (hotkinkyjo) isn't from LA, not even from the U.S., and no one forces her to do anything, she does live shows over webcam which are very popular.

No girl wakes up thinking "oh boy I'm going to get filmed shitting a softball sized hunk of candy today".

Who the fuck are you to decide what anyone thinks? I'm sorry for your lack of sex life, this doesn't mean it applies to everyone. Sticking things in your ass and shitting them out isn't an uncommon fetish, with thousands of pornographic movies depicting this, there's several subreddits that focus on this too.

Some of them are failed actresses, some want to rebel, a lot of them, a LOT of them, get into the business as a weird coping mechanism because of sexual abuse.

Yet again, you try to apply your sheltered view on sex to other people. You have no fucking clue how much money these people earn, doing something they enjoy. In the 90's/early 2000's a pornographic actresses could easily earn 30$k/month, now its much less, but still some manage 10$k-15$k a month, most modern pornographic actresses communicate with their fans/do live shows/chat/do requests/hook up with fans/etc, they're completely normal women earning a ton of money while having fun, they have supporting husbands/friends and loyal fans.

Instead of making shit up you could at least communicate with some of these people and get to know them better, they're not crazy/abused/junkies, just normal people like everyone else.