https://www.rts.ch/info/culture/musiques/13618878-lheritiere...
> Copyright income varies from year to year. The French press puts the figure at 1.5 million a year until 2016. > From then on, the amounts would decrease, because in 2016, Boléro, Ravel's most popular work, falls into the public domain. Since then, she claims to receive between 200 and 500,000 euros a year.
Ravel didn't have kids, so a random unrelated person received the rights.
Very lucky.