Is there any Business to Consumer intermediary/platform that doesn't do this? All big retailers (Walmart, Costco, etc) Apple Google Amazon. Once you sell or d

Is there any Business to Consumer intermediary/platform that doesn't do this? All big retailers (Walmart, Costco, etc) Apple Google Amazon. Once you sell or distribute through a marketplace where they also sell or offer products to the same audience, expect the best ideas to be copied by the platform owners. That's one of the downside retailers have to deal with.