In the past three years it has been proven that being a musician is 10% musical talent and 90% clever marketing. One new way artists have been capitalizing in this market is with text lists. You will text these lists and then will become subscribed to their texting channel. Then you can direct personally with your fans in an instant. Often times they send new music, or concert dates for the area codes the phone numbers are associated with. Merch discount codes, and content that can really allow you to connect with your fans. They will use massive banners at their concerts, and even just the number in their bios. For example JuiceWRLD: 
As you can see, its very easy to subscribe to and a new innovative way to market yourself.
