The problem is one of balance.

Write insecure software and you'll get screwed by hackers. Write secure locked down software nobody can touch or modify, and you'll get doubly screwed by a large corporation that wants to pound every penny they can out of your bloody corpse, upto the point your device is compromised by the corporation who can do whatever they want, but you cannot tell.

There is no win situation here, there are only trade offs.