[nattmat]

And when it is publicly known that the Apple, Samsung and Google compromises their operating systems, the adept criminals will flash their own operating system onto their phones.

Apple and Samsung need to provide a worldwide infrastructure for handling requests from law enforcement all around the world (also in the less liberal regimes). How secure can this process really be by now. It doesn't matter that the coppers cannot reuse the exploits, they will just request and receive a new one instantly.

Now criminals also have access to these services, since we now police corruption is a thing.