Citizens only, and anywhere in the world. If you're not a citizen but are a resident, you can support in another way - go to your friends who are EU citizens and ask them to sign! Even if they're not gamers, remember that it's about ownership in general. There are many other things that can and are being remotely shut down, such as cars, trains, implants for disabled people, etc. This is just the first step in regaining ownership of things you buy. Try asking a few people for support!