On mobile it's REALLY annoying to temporarily exclude sites from your search results. Not only does autocorrect regularly mess with what you're typing, it's also kind of a pain to get the address as long-pressing on the url opens up the browser menu to open it in a new tab or whatever, so you can't just copy paste it either.
I guess a workaround would be to click on "more results from this site" and then manually add a "-", but my keyboard loves to add a space after a "-" so I gotta go in and move it by one empty space to then remo-- that's not even that much better and just straight up not intuitive.
My suggestion:
You tap on "exclude site from this result" or whatever you want to call it and it adds -site:SITE to your search query, pretty much the same as the "More results from this site" does it.. just the opposite direction.