Earlier quoted context omitted.
I am surprised by this as well since Google is able to identify the origin of content (eg. Stackoverflow) and penalize sites for duplicating that content (or so they say). In my opinion it wouldn’t be difficult to identify the domains duplicating the content and penalize heavily. But, those sites are most likely displaying Google Ads so…
I just wish I could configure google to not show certain domains such as W3schools without adding a complex search query or installing plugins
"Permanently remove this site from search results" seems like the absolute easiest "personalization" to implement.