I never had a single “website blocked” dialog because of safe browsing. Meanwhile UBlock Origin often blocks websites, fullscreen with a warning.

On Firefox Safe Browsing is proxied through their servers and anonymized, so I use it. But tbh I have no idea how useful that is?

I use Search Engines (DDG, Startpage, SearX) or Bookmarks and never had such a block, does it directly filter those sites from search results?