Really the dollar speaks here. If ipv6 is a real requirement, than companies not supporting it will be hurt fiscally.
Taking a step back, one might consider how incredibly... unwanted and unwieldy ipv6 is. It's just a pain to deal with. Pundits will say "Oh, it's easy!". Great. Now explain why something touted as utterly simplistic and with supposedly zero issues rolling out, and is cited as having immense upside, has its adoption fought by companies which have top tier talent working for them.
Sure. It's all that top tier talent that's wrong. They're confused. It's not ipv6.
The main failure case is that it’s a painful or possibly impossible to setup your own public internet server from home, but ISPs are probably happy about that and games have figured out a work-around.
If IPv6 was a project at work, it would probably get killed as not a priority.
The cost of ipv4 is ultimately being paid for by customers in the form of higher fees for their internet subscriptions. And this is exactly a case where the government can help the market operate more efficiently by demanding standardization.
IPv4 hurts innovation by basically charging for numbers more than an administrative fee hindering newcomers to enter the market. Everybody suffers a little because of the networking effect. However, IPv4 seems to be a pain for the big companies too. Some, like e.g. Facebook are really pushing it.
With the supposedly "top tier talent" why does e.g. Azure have such a bad IPv6 implementation? Why is Cloudflare or big parts of GitHub IPv4-only? Isn't that meant for developers? What about e.g. Twitter?
The biggest problem is not the infrastructure. All the important programs like DNS servers, operating systems and hardware do support IPv6 more or less for the last 10-15 years well enough. The problem is developers that are stuck in IPv4 mentally, doing GUI windows, that only accept IPv4, only testing on IPv4, specifying database columns to hold only IPv4 etc.
Does Ziggo support IPv6?
This is one example, but there are many where we need to investigate more than just, "Does my ISP support IPv6?"