Yeah a friend of mine is a music producer and he signed a deal to have one of his songs at a designer clothes store when he had maybe 500 sales total. He has no idea how they found him but they paid him a few grand.
It's probably an easy way for them to get great music for cheap. There are underground artists making far better music than your generic EDM out there.
Well a lot of major EDM artists use ghost/shadow artists. Because they have to pump out a podcast every week with some of the music original they just have ghost minions do it. It's the brand they establish that sells it.