If food was infinitely replicable at basically no cost, you’d only be allowed to eat your cereals at the respective store.

Like a restaurant almost.

You're implying that piracy was killing media markets until physical copies were replaced with streaming, but hasn't that been debunked?

No, I’m saying that food companies would act like media companies do if food was trivially replicable, and therefore the fact that they currently don’t is not an argument for anything.

Retail exclusives including in grocery do exist. They are rare and limited to "high end" brands that are normally low volume, but there are things that I can buy at a Kroger that Walmart does not sell, and things I can buy at a Walmart that Kroger does not sell.

There have been disputes between food brands and UK supermarkets recently that resulted in specific products being unavailable in specific supermarkets.