It's defined in broad ways and can apply to many situations that depends on anyone's subjective opinion.
Honestly, who cares. It was a marketing stunt anyway, she didn't do it for the money cause she was earning waaaaay more on OF than what that bathwater would've brought in. And the stunt worked, it brought her a lot of exposure as almost every site covering internet culture reported on it. The term "bathwater" has forever changed its meaning since then.
Paypal are a bunch of thieves with vague TOS, so they can steal anyone's money for any reason they make up. They may have been the reason she made the jump to Onlyfans, since she had to all of a sudden make fast cash for that massive loss of income. I haven't read the tweet yet so maybe that's not what happened.