How will it happen? Writing open source code is one thing, maybe enough people will volunteer their work. But running an operational marketplace or social media platform is something else entirely. You need a real revenue stream to pay for hardware, connectivity, operations staff, regulatory compliance, etc. That stuff isn't cheap.
I'm been building towards an interoperable marketplace[0] and realized I needed to launch open-source alternatives to Shopify[1], Toast[2], Instacart, etc to take on the proprietary marketplaces.
It really comes down to merit and how much value you can bring to the actual sellers in these marketplaces with the software. If enough sellers switch, marketplaces will follow.
