Walmart has similar power to destroy your business if they refuse to sell your product. Google has no obligation to help keep your business afloat in the same way Walmart doesn't owe your product a spot on its shelves.
You can bet that if there wasn't Target, A&P, Pathmark, and local grocery stores, etc. Walmart wouldn't just be able to refuse selling your product without some sort of reason.
Google is significantly more dominant than Walmart, they're the only channel to your product for many, which isn't true with Walmart.
What are you talking about? Nothing you said has anything to do with anything I'm saying. You and the other commenter are skewing my comments with your responses into something they're not.