Tl;DR The EU makes sure that third party developers gain access to connectivity features to develop devices like smartwatches, headphones or VR headsets that have a deep integration to the OS.
It is crucial that the request process is transparent, timely, and fair so that all developers have an effective and predictable path to interoperability and are enabled to innovate.
I use uYou plus. It has to be installed via Altstore (which means you have to resign it once a week with a computer needed in the same network).
But it has the best features: