If Web 3 isn't an alternative to big ISPs, then it has nothing to do with net neutrality. If it is an alternative which can save net neutrality, then it is a threat and will be blocked if it gets big enough.
Not sure about the alternative to ad revenue either, as the first site you linked to was illegally storing tracking cookies without even an opt out.
Finally, nothing whatsoever suggests that blockchains could ever compete with cloud providers on price. Everything about running a program on Ethereum for example is much more complex and requires much more CPU than running it on an EC2 instance.