> I'm interested in why you consider it shady for a retailer not to sell a product. I don't see Google or Apple selling products from anyone but themselves (mostly. Apple does sell a few accessories and Google has some pure editions which they have a hand in). Pick any retailer, and there are brands and products they don't sell.

I think the equivalent for Google would be deliberately not listing duckduckgo or bing in search results for "duck duck go" or "bing".