Wouldn't a search service that blacklists the giant players -- Amazon, Google, Facebook, Instagram, Twitter, etc. -- also serve as the same kind of "web of disc

Wouldn't a search service that blacklists the giant players -- Amazon, Google, Facebook, Instagram, Twitter, etc. -- also serve as the same kind of "web of discoverability"? I imagine a search engine where the stewards manually whitelist websites that aren't full of SEO-speak, spam, and ads. Hell, I'm sure my own blog would rank pretty well!