[lpu4o74p]

The point of being GPL free is you don't need to release source code.

If you combine this with the other point of Fuchsia, hardcore security, the final combined result is that nobody can audit what Google is actually doing on "your" devices. And that's why.

[DannyB2]

Assuming Google doesn't need to hide anything, being GPL free could be so that others (like device drivers) don't need to release source code.