I'm willing to say no IPv6 support could be considered a class issue.
Old and wealthy western ISPs don't care because they hold onto an /8 or something and can live like that for the next 2 decades with NAT and NAT444.
But new, small, local ISPs or ISPs in developing parts of the world struggle with IPv4 availability the most, barely having any to do NAT444 for their customers, hurting performance even further in regions that already suffer from not the best network access
@TheIronFox not really, at least nothing in particular i guess
only thing that happened recently-ish is AWS starting to add charges for each IPv4 used to sparkled some talks but it's not new (people mostly complain about GitHub's lack ov v6 support in context of that)