Most of the internet was already BS before 'working' LLMs, where do you think the models learned it from? I think what you want is a crap detector, and I'm with you. Any ideas good ideas and I'll donate my time to work on it.
FYI Kagi has an integrated Blocker/Upranker/Downranker similar to this. Under their stats page you can see, which domains have been blockes/raised/... the most.
The most hated one by far: Pinterest and all locale-specific sub-domains.