I think you’ll find some ISPs will be reluctant to let go of CGNAT - they’re doing quite nicely by charging extra for ‘commercial’ services where it’s not in the way.
Fortunately, many of us know about cloudflare tunnelling and other services, so NAT really isn’t a problem to self hosters and even SMEs any more.
I’m pretty sure he’s using Twitter as some sort of home project science experiment.
The amount of sheer hate and vitriol I was getting ramped up hugely in recent months - the algorithm is definitely promoting hate, despite my almost never replying/posting. Lots and lots of far right political content also, it really didn’t feel random.
I bailed a couple of weeks ago.