For cell phones we’ve legislated that you can take your number with you. Email can be portable, but I think it’s gotta be easier to come up with a portable ema

For cell phones we’ve legislated that you can take your number with you. Email can be portable, but I think it’s gotta be easier to come up with a portable email address than expecting everyone to buy a domain and set up the DNS records? Does a registrar of email only domains exist today?