As far as Garth Brooks, that may be true, and would be a mistake. But someone should probably tell his record company to stop cutting checks to Sirius if he is exclusively working with FM Radio, because he has a full channel there that is also supposed to do that.
Garth owns his record label, he owns his masters, and he runs the Sirius channel. The Sirius channel isn't involved in his Dive Bar tour. That's all being done with FM, because FM is local, and Sirius is national. He does a weekly Facebook Live chat, but doesn't play music there. He pulled all of his music off YouTube. He prefers Amazon because he wants people to buy music, not stream for free.