I'm in western Europe and every ISP but the ultra cheap ones and the niche use case ones have stable IPv6 prefixes. Some do /48, others /56.
IPv4 is getting CGNAT'd more and more, on the other hand. One national ISP basically lets you pick between IPv4 CGNAT and IPv6 support (with IPv6 being the default). Another has been rolling out CGNAT IPv4 for new customers (at first without even offering IPv6, took them a few months to correct that).
This isn't even an "America and Western Europe" thing. It's a "whatever batshit insane approach the local ISP took" thing. And it's not just affecting IPv6 either.
IPv4 is getting CGNAT'd more and more, on the other hand. One national ISP basically lets you pick between IPv4 CGNAT and IPv6 support (with IPv6 being the default). Another has been rolling out CGNAT IPv4 for new customers (at first without even offering IPv6, took them a few months to correct that).
This isn't even an "America and Western Europe" thing. It's a "whatever batshit insane approach the local ISP took" thing. And it's not just affecting IPv6 either.