Apple already shipped attestation on the web, and we barely noticed

This might be where the internet really gets forked, as it's been predicted over and over since the '90s.

On one side, we'll have a "clean", authority-sanctioned "corpweb", where everyone is ID'ed to the wazoo; on the other, a more casual "greynet" galaxy of porn and decentralized communities will likely emerge, once all tinkerers get pushed out of corpnet. It could be an interesting opportunity to reboot a few long-lost dreams.

If that happens, governments will just order ISPs and mobile carriers to block greynet access.

As cool as 90's cyberpunk dreams are, to me they always seem to ignore the physical reality that your connection to "the net" always has to go through the chokepoint of an ISP, and that this ultimately is an indissoluble barrier on just how anti-establishment the internet can ultimately be.

Maybe it's because I remember when ISPs where fly-by-night operations with a bunch of modems spread on office tables.

You say it can't happen again, but IMHO that's not true.