There're a lot of curated spam-site lists on the internet already. For initialization, user can add these lists to blocklist for a good start.
I think it would be much better to be able to:
- batch edit blocked/lowered/raised/pinned sites
- search among these customized rules
- subscribe to external lists
With extension, for example uBlacklist, user can easily subscribe to curated site lists and block sites from google search results. It is the advantage of Kagi to have this feature enhanced and built into the search engine itself. But the feature can be even more enhanced.
Thus, another advise. Add a notice in the search result page shown how many site has been blocked, and let user click on a button to show what has been blocked. This can not only give use an insight that block is really working to enhance the experiment, but also let user to temporarily regret and check the blocked sites (because maybe the blocked sites can provide decent results sometimes imo, such as pinterest, geeksforgeeks). Btw, uBlacklist can do that.