I've found my result quality has gone up dramatically now that I use extensions allowing me to block domains from google search results. It seems silly that I ought have to do this, but Google has finally become useful again as a result.
For their commercial search results I'll grant you that there's an incentive. But for their non-commercial search results why would they care? That's how it used to work, you couldn't delete a domain from the paid results, but you could make it disappear from the unpaid ones.
Don't forget to use ungoogled chromium if possible
The only downside is you will have to load unpacked extensions instead of using the Chrome "store" and you will have to manually install Chromium updates from the same site:
That sounds like a bad idea for something like a browser that should get security updates as fast as possible.
Eg there are performance and memory differences between the two browsers, and different extensions are available.
"GHHbD" is a precursor to uBlacklist; and was for many years THE replacement to blocking sites on Google Search after Google removed the built-in function.
It also has a 'Block' button next to the search results (remember, the script existed long before uBlacklist), which allows to grey-out or hide results, based on subdomains down to the base domain.
The disadvantage of GHHbD is that it doesn't handled regex filtering. However one of its many advantages is that it does block TLDs: https://greasyfork.org/en/forum/discussion/comment/55821/#Co...