Would be great if Amazon considered more 3rd world countries as those countries don't have or barely have any kind of startup support/ecosystem. It gives the few individuals doing the startup thing at least some chance at scoring some "funding."
They're moving in the right direction. Until now they didn't accept any countries outside of the US. Going from "none" to "some" is a big step towards "all".
I don't see why they can't go to all today. They probably ship products to more countries.
Lots of countries have regulations about competitions -- they generally come down to "unregulated lotteries are bad" but exactly what paperwork you need to prove that what you're doing is a legitimate competition and not just a lottery varies.