*I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/socialmedia) if you have any questions or concerns.*
Just a guess; the account is a promotional vehicle for larger already successful artists. Artists are probably paying the owner of the account to post.
Why are there so many followers? Excellent content, and exactly the kind of content Instagram algo and Instagram users love. Growth over time.