[ShteiLoups]

It certainly does seem to be anticompetitive to (1) own the market, (2) collect the data about the market, and (3) actively use that data to replace or compete with third parties on the market. As per a comment below[1].

[1] https://news.ycombinator.com/item?id=21597614

[cmcd]

If this is anticompetitive then many brick and mortar stores are in trouble. Go into any large grocery store and popular items will almost always have a store brand equivalent prominently displayed and discounted next to the name brands.

[ghaff]

CVS even explicitly has signs that point out some house brand product has the same ingredients as X well known branded product.