CGNAT?
I'm using my phone right now to post this. It has a private IP over LTE and works just fine. When I tether my laptop, it works just fine. I regularly visit sites behind load balances that multiplex at layer-5, in fact, there are often tens of thousands of major websites operating sharing a single IP.
Our current IPv4 problem is entirely greed based and artificial. There is absolutely no reason we can't solve the problem. With less than 100,000 registered active autonomous systems on the internet, we certainly should be able to make due with a few hundred thousand /24 networks.
Biting the hand that feeds IT
