That’s scary
Again, pure speculation and really the most generous means of explaining this controversial decision.
I've missed where this has security implications. Did you mean privacy implications?
Companies doing good things brings good PR. That could just be it.
Which is a very scary statement any company to make (the means to get to that point?!). But I am sure some countries see this is as a great technology to push for slogans of their own: "no citizen of Nonhomostan is a practicing homosexual!", "no citizen of Oppositionkillerian has any mind-corrupting western banners on their phone!"
This technology will allow large powers to make sweeping statements about data kept on private devices.
Sadly, it's probably really to appeal to China or the US government.
I wouldn't be shocked to hear of some secret court order ordering them to add some kind of backdoor, and this legally meets the bare minimum.