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For ISPs (and mobile carriers) that are actively involved in their infrastructure, CG-NAT is more expensive to run than native ipv6 (aquiring IPv4 public addresses; tracking connection states; if all customers are on private IPv4, maintaining multiple distinct private networks with the same address space is a hassle too), so those ISPs are pushing to make services available over IPv6 (I've heard from T-Mobile USA and Jio India), but that doesn't mean they won't also run CG-NAT for customers on older devices and for services that aren't IPv6 -- it just reduces the deployment. For smaller ISPs, or where everything is contracted out, the cost savings aren't as apparent.