All those points would not be an obstacle to an open source solution that is not trying to build a grand unified global Uber drop-in for random rideshare driver

All those points would not be an obstacle to an open source solution that is not trying to build a grand unified global Uber drop-in for random rideshare drivers to sign up with, but instead only ("only") tries to be an installable turn-key solution for existing operators (or regional federations thereof) to add the smartphone hailing user experience to their existing offering, without much investment. I did not find a clear answer on the site wether this project is aiming at independent ridesharing or at being a turn-key solution for more conventional taxi dispatch organisations. There is the idea of "hack and tune it for your city", which is clearly not the global approach, but then they also advertise "1-minute hiring", which is definitely not what I would be looking for if I were to customize it for my hypothetical preexisting organisation. Something like wordpress or the myriad open source online shop systems, but for taxi dispatch and with a unified smartphone client (or client protocol, actually) that can work with all installations. That might be the best way to avoid a single gobally dominant private network that can set their "tax" on all rides at will. The app/clients might be supported for discovery by a global registry of regional installations and some trust management, but it might actually be not only easier but also more reliable to just leave that to plain old web, with something like libretaxi:-URIs to connect the app to a regional network discovered by your search engine of choice.