> GPL only prevents old versions from becoming closed source.

This is false, https://www.gnu.org/licenses/gpl-faq.html#LinkingWithGPL

> Having a working system providing competitive value to others is much more important.

I don't consider dependence on Google as "working for the users".

> The good reason is that those devices can't provide industry standard security.

Obeying Google is not "security", even if it's the industry standard.

Linus doesn't release a linked version of the kernel so that FAQ does not apply

>I don't consider dependence on Google as "working for the users".

Why not? They work more for users than other organizations that you would try and replace them with.

>Obeying Google is not "security"

I don't know what you are referring to.