I don't see how this "child protection" enforcement would help in case of small obscure websites with porn and gore? No way their admins gonna comply. I doubt ISPs would go that far to DNS whitelist compliant websites only.
Does the admin of the small website hypothetically agree that they don't want to show gore to children?
I never said this would help... in fact, I’m against this kind of measure, at least the way it’s being done. But I wouldn’t be surprised if Brazilian ISPs are forced to block this sort of thing (just look at what happened with Twitter (X) the year before last).