I think it's because Firefox have made their own client and they only want to offer Wireguard connections.
Since Wireguard is still a bit new and buggy, they probably want to make sure it's stable and roll out in stages.
Since Wireguard is still a bit new and buggy, they probably want to make sure it's stable and roll out in stages.
They are already rolling it out slowly via a waiting list. Limiting that to US only doesn't really change how "widely available" it is in order to iron out the kinds. Seem more likely this is regulatory related.