"Spotify" had 16 600 000 searches on google last month so this is a huge niche. A lot of people want premium and we teach them how to get it for free so this is a very profitable niche. How do i promote this niche? You can use social media like Facebook,Youtube,Instagram and others. you can make a website or blog and do seo. You can do paid traffic like Bing ads, Adwords and Facebook ads. There are thousands of ways to promote this sky's the limit. Thanks and Good Luck!