How Google eats a business whole

I can't find the quote I'm looking for (on google ironicly), but my approximation should do well enough.

"To neglect selling to Walmart is to invite death. Selling to Walmart is to embrace it"

This is from a CEO of a large manufacture that was stating by Walmart's size, if your competitor sold to Walmart they could grow huge almost instantly and push you out of the market with economies of scale. The problem with Walmart is they want constantly lower prices. After growing huge and profitable with them, could find yourself going out of business very easily. Even worse, if Walmart dropped your product for any reason, you have a huge amount of production and no market for it.

https://www.fastcompany.com/47593/wal-mart-you-dont-know

Google is the new version of Walmart.

I am personally of the opinion that it is unethical for Google to strip these websites of the traffic (and revenue) they deserve by co-opting content that they have, in many cases, spent decades curating. If the websites have terrible design or too many ads, users should inform the website owner organically by choosing not to visit the site, but for Google to abuse their market position in this manner is wrong, I believe.