alt Hacker NewsGoogle could have easily won that fight by blacklisting scrapping spam sites and spam portals. They just didn't.
There weren't that many with high ranking. I could filter out most of them in like a week of working normally and just right clicking them with the blacklist extension in Firefox.
Nowadays it is probably harder though when Google have broken the internet culture.
If you blacklist them just for yourself, the sites don't care, no economic impact. If Google does the same, they'll work around. There's lots of spam-only sites, but they also often cleverly avoid detecting by mixing in content ranked as valuable/legit. SEO also certainly "attacked" otherwise legitimate sites like Reddit, although what GEO is doing there is far worse I imagine.