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It would be fun to make a “No Swipe Image Viewer” app that lets you pick an image to share - and then presents some searing penalty like a screamer to anyone who swipes to the side.
Just be warned, not for the elderly or faint of heart.
This already exists. Probably several of them.
I had one back in the day that would allow you to pick an arbitrary selection of images from your gallery and would only display those. Ninja Snap, I think it was called. If the holder tried to swipe beyond this it would respond by taking pictures of whoever is holding the phone via the selfie cam (inevitably pictures of them up their nose, given how they're likely to be holding the phone) and eventually start admonishing them for being an assmunch and violating the trust of whoever's phone it was.
Anyway, Focus lets you do this in a less trollworthy manner. It also has an option to lock you phone if someone hits the home button trying to get to other apps or snoop around in other stuff. Several other Gallery replacement apps do, as well.
I just tell people "don't swipe unless you wanna see my dick" and that usually does it.
Faceswap the offender's face onto lemonparty in real time.
We have this technology.
While recording their reaction