Their top 50 use to be featuring the artists who reaches the most plays and gets the most notice but not anymore, I don't know who they've got deciding who gets to be in the top 50 and sponsored as well but it's definitely not a fair system based on who's deserving the attention the most. Their curators must be deaf or something or maybe they just don't really care that much about music.
Tip for consumers: the worse you sound the more likely you are to be featured