Ublock Origin is your friend. Add custom filters to remove these from search results. For example you can remove Pinterest from Google result using filter goog

Ublock Origin is your friend. Add custom filters to remove these from search results. For example you can remove Pinterest from Google result using filter google.##.g:has(a[href="pinterest.com"]) And DDG using filter duckduckgo.##.results > div:has(a[href="pinterest.com"])