I've not really considered this before, but I might actually be interested in a 'white-listed' web. This is obviously possible entirely client-side with a plug-in that white-lists domains and allows you to edit the list.

I'm wondering if there's a genuine opportunity here to go further. A client-side browser plug-in, plus a SaaS which automatically vets pages on-the-fly to guesstimate the chance they're AI-generated, spammy, etc. So if you visit a new domain the plug-in auto-updates the white-list, prompting you to confirm the judgement, maybe prompting to add the domain to UB0 or similar.

Again, this could all be done entirely client-side if the guesstimation algorithm is efficient enough. But a centralised database would confer other obvious advantages, like basing the guesstimation score on decisions from similar users, building a giant up-to-date list with fast lookup, that sort of thing. Site listings and other data from Kagi, marginalia.nu and Mwmble.com would be a great starting place. Obviously it would have to protect against the system being gamed, Sybil attacks and what have you.

I'd pay a dozen CURRENCY per year for that.

Maybe this exists already, or something similar?