The whole idea of the so-called gig economy is that you have a huge platform that connects gig workers to clients. How could you replace that with one app for each worker? Would you install 200 taxi apps and start trying each of them when you want a cab? Or would you order an Uber?

And if you are envisioning an open-source platform, who will run it? Who will vet workers on it, even to the basic level that Uber does (e.g. Make sure they are real people, have a driver's license, and a functioning car)?