You know that, Noone has a definite answer about when regions will be restored, right?
You say many regions are unsupported, it’s true but on the other side they brought 18 regions back as well, biggest ones being France, Brazil and Turkey.
All you can do is to wait patiently till Mexico gets supported again.
Also it’s not any kindof racism based on country or whatever else. They stop supporting countries because some just become very hard to manage because of Rules & Regulations, frauds and scams in that region and a lot of other factors.
If you go to
And look into all the bits you’ll get more information about why this problem has occurred and what all has been done till now to get regions back.