Earlier quoted context omitted.
Also - just the amount of people who would game the system afterwards all the search results would be utterly useless.
Ye and anyway you could return x10 worse results than Google's current results and still become the new dominant search engine if you've got infinite $B a year to outbid Google to be the default on browsers and operating systems and a big salesforce to onboard the advertisers. Man this is the exact playbook they used to become the search engine in the first place. They literally were Yahoo's search bar at some point…
In order to compete, you would need good results and good performance for your organic results and your ad program in addition to a huge budget for traffic aquisition and patience and ability to execute on strategy consistently over multiple years.
Also, keep in mind that people will judge based on perceived quality, not objective quality. Simply being shown as a Google result increases the perceived quality for most results -- in order to be seen as equal, the competitor will need to have consistently better results.