So apparently in Canada it's actually illegal to deface currency. Like the act itself is a crime with a prison term. It's not like the US where it's only illegal if you do it for the purpose of fraud.

https://www.leicestershirevillages.com/the-legal-implications-of-cutting-money-in-canada-uncovering-the-consequences-of-defacing-canadian-currency/

Which is a fucking stupid law if you ask me, as a Canadian.