> operated at a loss as a business tactic to force out competition and kill off local grocery stores

Wouldn't surprise me. I know a guy who invented a device for truckers that became ubiquitous in truck stops across the US. This would've been like 2014.

He refused to sell on Amazon, so Amazon duped his product and sold it at something crazy, like half price, until he agreed to list (at which point they dropped their competing product)