Deemix is a good way to build up your local cache from Deezer, at which point you can serve it locally.
It will mess with artist renumeration though (which seems important to you), so you might want to find another way to compensate your favourite artists.
Lots of ideas are patented, especially by large companies. Some ideas are pursued by the company themselves, while others sit in the patent war chest to (maybe) generate passive income and help with future litigation. Very occasionally they are used for prevention.
Regardless, such a system would be a reason for many people to avoid buying a particular car or brand of car.