I'm not entirely sure, actually, but I think it mostly has to do with legal clearance (but might be wrong here). Your country is autodetected from your IP, so a different credit card won't work, I think.
I did recently build a waitlist, so you can sign up to be notified when it becomes available in your country. We're not linking to it from anywhere yet, but if you promise not to tell (just kidding), you can already find it at https://relay.firefox.com/premium/waitlist/.
I did recently build a waitlist, so you can sign up to be notified when it becomes available in your country. We're not linking to it from anywhere yet, but if you promise not to tell (just kidding), you can already find it at https://relay.firefox.com/premium/waitlist/.