My most recent ISP does CGNAT. They don't hide it, it's mentioned in their support pages. A quick email is all it takes to switch you over to an open address though.

Anyway I've got a $5/mo server with akami that looks after my email and it's associated domain.

It took about three hours of following a guide to set up DMARC and etc etc and it works unobtrusively, and is about ten times faster than my old ISP IMAP account that I had for about twenty years.