I imagine it's kind of like "What's stopping someone from forging your signature on almost any document?" The point is less that it's hard to fake, and more tha

I imagine it's kind of like "What's stopping someone from forging your signature on almost any document?" The point is less that it's hard to fake, and more that it's a line you're crossing where everyone agrees you can't say "oops I didn't know I wasn't supposed to do that."