You are confusing IPv6-only and running an IPv6 core. Those are not equivalent. >It will probably not be the hosting company paying for the IPv4, but rather it

You are confusing IPv6-only and running an IPv6 core. Those are not equivalent. >It will probably not be the hosting company paying for the IPv4, but rather it will be the end customer, and they may not want to pay. Of coarse it will be the hosting company paying for the IPv4 addresses as they will be the ones owning them. Of coarse the end customers will complain and not want to pay, but pay they will as they have no other choice. It’s neither here nor there whether the end customers run IPv4 or IPv6 internally, it’s the public IPv4 addresses that matter.