Huh, I figured they were rumors.

But it's fairly close to a tontine. But those are banned in the USA. But in those cases, rewards are split regularly between survivors. People who die with a tontine lose their share.

https://en.wikipedia.org/wiki/Tontine

I could see a movie about that, with living tontine holders sending out hitmen to remove other tontine holders, so they can get more money.