The NAT issues only apply to people behind CGNATs which also don’t have IPv6… which should be precisely nobody, unless of course some ISPs are violating some rules there, which could get them fined etc.
But you can simulate a CGNAT at home, assuming you have IPv4 connectivity, just connect a second router onto your main router and then tada, you have double NAT, which is basically what CGNAT is. If you want more fun chain a third router and then you effectively have a double nat behind a cgnat, which now that I think of it shouldn’t be too uncommon either, given the amount of poorly set up “wifi range extenders” out in the blue and/or people manually disabling ipv6 or whatever.
