I love that this is the (correct) response here. /r/Apple is full of morons that read the press release and honestly believe making this system scan the whole file system is impossible.

>The entire technical infrastructure to scan your entire device for arbitrary content is being built and deployed.

It's a proprietary OS. This literally could exist already and you would have zero clue.

The difference between open and closed source is not lost to anyone on this site. There is a grand canyon sized gap between 'could already exist and you have no clue' and 'we have built and are deploying this system'.