This is really interesting. Thanks for doing this. Checked one of my favorite artists who I would think is a very minor player in all this, and who is pretty original (Keb' Mo'). If I am reading the results right, he has $7,059 – $16,345 at risk. Wow. I hope this is widely used by the artists to understand the situation. Again, great work imho (I know virtually nothing about the music industry).
When the Music Modernization Act passed in 2018... all US digital streaming mechanical royalties we're just held until the MLC was operational in 2021. So this is money owed from 2018 through 2026, it adds up.