[BlueTemplar]

Indeed. There's no point in doing all of what the OP did.

IPv6 was finalized in 2017.

In 2020 Europe ran out of IPv4 addresses, and many Asian countries never had enough of them to start with (so quite a bit of people are effectively IPv6-only already).

An "I"SP that doesn't provide a /48 or /56 IPv6, shouldn't be legally allowed to advertise that they are providing "Internet" (and technically/historically, they're actually providing ARPANET, IPv4 having been supposed to be only a temporary, experimental version.).

And just like it was done for obsolete TV technologies, laws should be put in place first outlawing hardware that isn't compatible with IPv6, then later hardware compatible with IPv4.