This is really the core of my disappointment in Google: their poor handling of malicious SEO. Having humans go over shared site blocklists that people use to improve results, hand verify each entry, and remove those sites from Google results would go a long, long way.
I'm talking about lists like these: https://github.com/quenhus/uBlock-Origin-dev-filter/blob/mai...
It wouldn't take a small team more than a few weeks to get through these lists -- most of the work has already been done.
Alternatively, they could just let us add these lists to a first-party interface so we don't have to use plugins to achieve the same results.