A few points I'm skeptical of: simply connect to the seller’s infra instead of locking them in. One of the value-adds of Amazon is there's a whole bunch of tech sellers don't need to know how to write, run, and maintain. You'd need to understand how big the niche "technically literate to run their own e-commerce business, but selling on Amazon for other reasons" is, then how your operation would answer those "other r…
i think the branding "open source Amazon" is just way too ambitious/big. invites a lot of confusion/criticism if Amazon is different things to different people.
Amazon’s primary source of revenue is as a market-maker/logisticics provider, so why not position yourself as a competitor if it gets contributors interested?