We already have 2 blog post showing how to create adsb receiver and use the data on drone or to stream to a free or paid services
ADSB for mission planner just using an SDR dongle and Learning ADS-B Technology: A DIY Guide
Those database are well feeded already and have easy access for most. Without some huge plus value and investisment, I doubt your project get much attention.
There is also SoftRF project to make small receiver : GitHub - lyusupov/SoftRF: ✈ Multi-functional, compatible DIY general aviation proximity awareness system and stratux : https://stratux.me/
There are problably a lot of other project doing this as the cost of material is quite low now.
For Uspace, rules are still in work, but it will be more complex than just feeding the current position, speed and heading.