I recently used paypal to send a dollar to a coworker with the description of “tardigrade”, after reading a story on HN about how they were blocking transactions containing that string.
Sure enough, the transaction was blocked, my account was disabled, and I had to send paypal an email saying that I wasn’t an arms dealer.
Dunno why this is being downvoted - i once jokingly added a note mentioning “meth” paying someone for dinner (in reference to our conversation at said dinner) and google suspended my account temporarily and cancelled the transaction