It's barely supported. Most providers here "offer IPv6", but each has a different gotcha to actually using it, if it works at all and they didn't just route you through hardware that doesn't know what it is.
Just because you have a IPv6 address doesn't mean you're actually using it. At best you're tunnelling IPv4 traffic through your carrier's IPv6 network. Current estimates (from Cloudflare) show only about 34% of the global internet uses IPv6.
If you only used IPv6, you wouldn't be able to access nearly 66% of the internet.
Mordor itself, Russia. Technically, most ISPs support IPv6 here but as I said each has something weird in config that makes using it... Fun. I don't remember specifics since I'm mostly looking at it from consumer side, but I could try finding the article (in russian) that talked about it.
My current connection doesn't have IPv6 at all according to https://ipv6-test.com/, although I'm not 100% if it's because of provider or Cisco AnyConnect blocking shit.
When you when you sign up for internet here, you get a dynamic IP, it's been that way for... As long as I can remember, really. Definitely more than ten years. I know in Moscow people used to get white IPs way back when, but that's long gone. Not really a problem since most people don't host anything.
It's becoming more and more of a problem I'd think. Blocklists just become longer, so the more an IP is used by random people the less useful it becomes.
Not at all only. At times you have both IPv6 and IPv4 and other times you can still get IPv4 at no additional cost like when you run your own router or modem. The layperson will be given IPv6 by default, but it's not the only thing you can get.
The older ISPs already own all IPv4 blocks, so while they can still give them out to private or professional customers, it would be stupid to sell the blocks to competitors.