Stole unknown amounts of peoples retirement.
Ruined many peoples lives.
How is 50 years too long? The literal largest fraud case in history doesn't even have a life sentence...
We are sending a clear message, grift and steal your way to the top and then get out just in time to retire with all your stolen goods.
You know when he gets out he is gonna go unlock a dead wallet with 100BTC (or some other coin) in it and become an expat.