Search engines in general have realized that it's more profitable to show you irrelevant results than to show you nothing. Furthermore, they've realized it's more profitable to show you irrelevant results laden with their ads than show you highly relevant results from ad-free sites.
Perverse incentives at work!

This is precisely what happened. When google merged with doubleclick.net the new company should have been named doubleclick.net and not google. The old google ceased to exist at that point and was swallowed by an advertising company.

phind.com
Kagi (don’t use it personally)