I don't understand. Their partner is Mullvad. Mullvad has servers across the entire god damn globe. Why is this US-only? Why is it US-only going into early 2020, as in, months to provide service to non-US regions in what's probably going to be a limited roll-out to "select regions"? It's not the 90s anymore. It's time to drop the US-centric crap. They're not a publisher. They're not distributing movies or TV series.
How about offering support in all the countries and time zones a world-wide rollout would require? That's not trivial.