In the UK there are FTTH products being rolled out by a variety of companies in addition to BTs (and virgins) fibre networks. Many of which are being bought out

In the UK there are FTTH products being rolled out by a variety of companies in addition to BTs (and virgins) fibre networks. Many of which are being bought out by the biggest of these alternative fibre providers CityFibre. Many of the ISPs on CityFibre aren't able to buy the IPv4 space they need and are too young to have acquired it years ago like the older ISPs have. Instead they use CGNAT to provide service IPv4. Carrier grade NAT is definitely an issue for the average person because the bank websites often don't work properly/kicks off security as they expect unique IPs for their customers. The need for CGNAT on IPv4 I can understand, it shows the extent of the problem and cost of acquiring IPv4 addresses, but they are also choosing to not deploy IPv6. Unlike the older ISPs they have no legacy to worry about with hardware to be upgraded and reconfigured and potentially a complex roll out, some of these companies are mere years old. When that use case can't bring IPv6 to the ISPs I have no idea what will.