It enables a collaborative effort in blocking spam / low value domains.
If you make a block list, please submit it to the list I’ve made: https://github.com/rjaus/awesome-ublacklist
(There’s no great subscription discovery as yet)
-stupidautogeneratedcontent1.com -stupidautogeneratedcontent2.com etc
I figured sooner or later Google would pick up the signal but I think instead they just started ignoring my "- requests" as I stopped using them. edit: or maybe they fix the problem. Spam sites used to be a problem during the early decline of Google. I think what happened was that problem actually almost disappeared for me and was replaced by irrelevant results from non-spam-sites
Edit: mahalo.com was one of those, https://en.m.wikipedia.org/wiki/Mahalo.com
google.*##.g:has(a[href*="example.com"])