Someone on another Amazon related thread mentioned that 50% leave after 2 years and 80% leave after 4.

If you do the math on their TC to see how it actually works out from month to month, it makes sense. Unless you get more RSU's, you take a huge hit in pay, unless you weren't cashing in on them to make ends meet.

That's accounting for stock growth.

With the flat share price, there's no 4 year cliff anymore...

So basically you get most of your comp at 2 years? So crank hard for 2 years and then bounce?

You get a bunch of cash up front; majority of RSU's come from your 3rd year vest date on.

You get most of your RSU comp after two years; vesting is back-loaded. Many (most?) people wash out before they collect, which obviously works out well for Amazon.