No, and they have no excuse.

The cable ISP recently switched to a DOCSIS 3.1 network in certain areas, and almost all customers have a modem/gateway that has IPv6 support perfected (IPv6 is quite an old thing, would be weird for it not to work properly now - on the CPE side), but nope, they don't want to.

They don't like their users being able to host content, given the fact they make it extremely difficult to pay for a static IP and get a modem or have your gateway switched into bridge mode (the newest models have had that removed from firmware, and the ISP downgrades you to 3.0 speeds if you want bridge and pay for a static IP). I am not sure why, but the whole company is extremely antagonistic to the idea of a user having a public IP address of any kind.

Mobile carriers do not support it either, and have no excuse at all, given the modern LTE Advanced networks they have deployed, with VoLTE, and the modernized core infrastructure by Huawei to the highest standards of the 4th generation of networks. Except IPv6 of course.

This is the same in most Balkan countries and in other parts of the world.

That is odd. I'm not involved in networking or ISPs, but supposedly a big motivation for IPv6 is to reduce load on CGNAT systems -- they're expensive, and problems with them generate support calls.

e.g. https://www.retevia.net/prisoner/

It is absolutely not logical, I know. That's the weirdest thing. I just don't know WHY, but the whole thing is oriented against letting the user host anything AT ALL COST.