I think you need to be around the right age group to have heard about it. My 9-year-old niece is obsessed with Musical.ly. I often look at it, and think there's no way I would have ever thought to invent an app like that.

Your world is narrower than you realized.

Musical.ly is popular with children and young teenagers that perform dances to their favorite songs and share them with others.

60M monthly users according to article (and probably growing). $16 per current monthly user. No idea about the running costs for the service, but does not sound too unreasonable.

Wikipedia writes: "Musical.ly's structure allows the viral dissemination of trends throughout the platform. The hashtags that are popular on this social network usually make reference to bits of pop culture and trends among the internet world. Because of its massive usage, a lot of events launched within the app can become viral global events, especially among teenagers"

This has turned into a very well-curated A&R scouting platform. The valuation isn't surprising to me at all.

Phew. I am not the only one.