A Boogie Wit Da Hoodie is a great example of this. You will absolutely never see his name mentioned anywhere on these forums (which is expected) but you will also never see his videos on TV, hear him on the radio or see him in any sort of media or at award shows yet his album went to #1 without a CD release or any hit singles promoting it. Hip hop and rap artists have huge fanbases online who will Spotify/YouTube the shit out of mixtapes and albums. They don't need any traditional methods of promotion to be a success. People are talking about Lil Nas and his place in the pop industry and how he might struggle for another mainstream hit again and how he might end up as a one hit wonder but whether or not he gets into the Billboard top ten again with a single or not, you can be sure he'll be racking up millions of streams and YouTube views in the background. He's not just going to fade away and never be heard of again.