Valid points from a few contributors, my STG£0.02 worth:
If lobbying NTA concentrate on PUC. The cost of base/app jobs has just increased by 25%. If we take the average fare as €12 the pro rata increase works out at €3 per job hence we need PUC increased from €2 to €5.
If making an app, keep it simple. You don't need a payment system just integrate Sumup and Revolut. Base it on Google Maps, it's cheap, easy and quick. Use AWS for server resources, it can be scaled up or down in a highly cost effective manner so you can put something together that, if unsuccessful, doesn't have to disappear but could hang around in the background doing little or nothing and costing little or nothing. Finally, don't think you're inventing something of value, you're not. Open source it... the whole lot of it.
Ideally what is required at this stage is what BS first suggested. An organiser. Maybe you could take on that role, UW? Whether your primary interest is to lobby NTA, lobby Free Now or devise a driver owned app the first thing you need is the support of drivers. There's no reason why a petition couldn't or shouldn't identify all 3 of those objectives as potential strategies. What I would suggest - and I'd be happy to help with the tech side - is a simple website inviting drivers to register their support for some or all of those objectives in one place.