FYI, Kagi lets you do this and personalize it as you desire. They even share aggregated stats※ about which domains users choose to block/lower. (Mine generally match these stats.)
I sincerely appreciate the diligence. I really did see Pinterest results over a longish span. I may well have only noted their presence and not their absence - skewing my perspective.
Overall, my experience is very positive. I'm on many PCs throughout the day and I miss Kagi when it isn't there.
Kagi doesn't provide it natively because of performance issues. They contributed to ublacklist to add kagi search. You can use it with regex and matching rules
> If you need advanced blocking features, such as specifying rules by match patterns (e.g., ://.example.com/*) or by regular expressions (e.g., /example\.(net|org)/), the uBlacklist browser extension includes support for Kagi Search.
※ - https://kagi.com/stats?stat=leaderboard&k=-2