The US wasn’t even the first to ban it. In 1937 Marijuana Tax act was passed that effectively prohobited it, but a full ban came in 1970. Countries that banned it before 1937 include, but are not limited to: Thailand, Irish free state, Romania, UK, Indonesia, Australia, Lebanon, Sudan, Italy, Panama, Canada, South Africa, Mexico, Jamaica, Greece, Singapore…
You have to opt-out. I got an email from meta with a link to the form. Doesn’t seem to matter really what you write. It got approved in less than a minute for me. I think they purposfully made it look like it’s more work than it’s worth.