Trying to do support in multiple languages and timezones can be tricky (and surely adds to the cost), I don't know for sure if that's the reason but it's a reasonable one.

Let’s take the fact that they don’t have the resources to launch to every user all at one for the reasons stated in comments near this one. Do you agree with that premise? If so, what do you propose as a more ideal limited rollout strategy? First come first served? That has its own share of problems with user burnout and people feeling annoyed after being left out as well.

That is a very good point on it possibly being regulatory related. I agree, that is probably also a big part of it.