When you are the only grocery store for 500mi yes you functionally have a “monopoly over your shelves.”

You can switch your search to bing in less time then it took to write this message.

Your 500 mile analogy simply does not apply.

As a business owner you can’t tell all of your present and future customers you’re only going to be in Bing results going forward. This isn’t about what an individual chooses to use. Google is effectively the Yellow pages of the internet. In that era you could take out ads in the newspaper, but no one was looking there when they needed to find a resource they needed now.

There's Bing and DDG (aka "Bing without tracking").

Bing barely has 10% of the market despite being owned by Microsoft and DDG has .5%

I am a DDG user and even I recognize they are barely a blip.