This is not available in many countries. Is it due to legal issues, to preserve server capacity or a marketing gag?
It's legal issues.
Not that there are actually legal blockers. It's just that for the team/person creating this thing, it's too much work to pesker legal to find out if there are legal blockers. Legal is going to CYA on these things anyway.
There is a group of countries where it's "probably fine", so those countries get to try demos like these. There are other countries where the policy is "talk to legal", and nobody wants to talk to legal. So those countries don't get access to the demo.
I'm not involved here, but I've seen these issues play out quite often lately.