It's that Google has destroyed their own search results in order to continue to expand their revenue opportunities.
If Google:
- Enabled downvoting on results, like YT videos. (Has its own spam problems, just like YT)
- Allowed you to block certain domains from your search results, like YT videos. (If they added some kind of "coordinated network detection" and down-ranked domains coordinating with ones you've blocked, that'd be pretty cool).
- Allowed you to create your own custom search engines, like "Programmable Search Engine".
That would be incredibly valuable. They already have most of the tech. They could even create a subscription service around custom search engines if they really wanted. Plenty of people would find something like that incredibly valuable.
Anyhow, buried in there is your startup idea. Remember: your startup doesn't have to generate the same revenue or profit as the incumbent on day one to be successful.