Amazon is basically allowing sellers to carry all the risk while product testing and marketing a product.
If it does well enough, Amazon can use the same manufacturer and release a branded "Amazon Basics" version that pops up in the same search for the same product but cheaper as Amazon doesn't have to pay someone else $112 for the listing and warehousing, and the original seller that did all of the actual "work" (as far as making it a profitable venture) is SOL.
Throw in a few dozen word salad named drop shippers who undercut Amazon in exchange for increased shipping times and the originator is wedged out of the market or cut to razor thin margins for years of effort.
If it does well enough, Amazon can use the same manufacturer and release a branded "Amazon Basics" version that pops up in the same search for the same product but cheaper as Amazon doesn't have to pay someone else $112 for the listing and warehousing, and the original seller that did all of the actual "work" (as far as making it a profitable venture) is SOL.
Throw in a few dozen word salad named drop shippers who undercut Amazon in exchange for increased shipping times and the originator is wedged out of the market or cut to razor thin margins for years of effort.
Rinse and repeat.