Comment by WhyNotHugo

> So... all your hashes will be uploaded to the cloud?

No, it'll be done on-device.

> How do you prevent them from scanning other stuff (memes, leaked documents, trump-fights-cnn-gif

Nothing. Given that it's only done on their closed-source messaging platform though, nothing is preventing them from reading your messages already.

But yes, it could potentially be used to detect images that the current political party doesn't like.