Their software stack is open-source, and their machines don't have any telemetry or external dependencies. They're designed to be air-gap-able, while still giving you a cloud-like experience

That's a great start but it doesn't actually solve much.

It's a closed system so I can only buy hardware through them, what if at some later date the US demand hardware backdoors, what if due to tariff (or other drama) we can no longer buy them? How do we get spares?, what do we do if a server breaks?, what if they go out of business? What if we need some other kind of servers or offering they can't provide?