For what it's worth, there's a chance that the word "hack" in some invoice triggered some really dumb system for trying to detect bad actors or items that viola

For what it's worth, there's a chance that the word "hack" in some invoice triggered some really dumb system for trying to detect bad actors or items that violate their TOS. I had a small hobby business years ago that had the word "gay" in a PayPal receipt (it was not pornography or anything indecent) and their dumb filters saw that word and blocked it without recourse. I bet if you used some words similar to this in PayPal receipts regardless of context, you'd probably also risk your account being automatically blocked: drugs, terrorism, porn, sex, alcohol, money laundering, slavery, guns, nazi, murder