In theory there is no difference between theory and practice
In practice, ideally you'll get 2 years of more or less useless updates signed by a private key left on an unsecured AWS bucket, updates which will replace any existing bugs with new, fresh ones.
Then nothing. (If you're lucky the last update won't put your device into a "slow and useless" mode to help you decide buying the newest model.)
But more realistically, you'll just pay for those updates through a higher price, but won't ever get any (unless a problem gets lots of media coverage and causes bad press). A dollar you spend is a dollar you don't get to keep, does it really need explaining?...