Why YSK: You should know that you can protect yourself as a buyer or a seller as anyone who uses Etsy. It’s a very popular sales platform and they’re making some changes to prevent class action lawsuits against any shenanigans they might pull against buyers and sellers on the platform. You have the ability to opt out of this to protect yourself; the linked article explains how to do this.
How on earth are these legally enforceable?
Not sure about the specifics but it might not be enforceable. Just because a company says something in their TOS doesn’t mean it’s true.