Reddit (and other user content sites like it) is an incredibly useful tool. But the content and quality of subreddits is wildly different from one to the next.
It therefore makes no sense to block the entire domain "reddit.com" because some parts of it I definitely wish to see in my results.
However, I wish to block certain subreddits from showing up in my personal results.
The ability to block/downvote/normal/upvote/pin subreddit-by-subreddit would make this site and Kagi a much more safe and usefull tool.
The tech already exists: it's the same now for separate domain names.