Yeah, few moments ago it hit me there could be a market for a phone case with in-built camera(s) that photograph your screen at a shallow angle on demand, and transform that into a screenshot automatically.

However, my idea happens to hit a very new limitation: for some reason, "privacy filters" are suddenly a thing. New phones have them built-in as some new magic display function, and for everyone else, there's this mad marketing push to get people to buy and use privacy foils in place of glass/foil screen protectors.

IDK what's up with those. Since when "shoulder surfing" with smartphones is a real problem, and why do marketers and product designers bet there's so much latent demand for it?

Recently handled someone's phone who had it. Neat technology. But the use case for it doesn't make sense, for the reason you specified.

The only thing I could think of is if you want to browse TikTok or Instagram in public and don't want people seeing the weird shit that's on your algorithm, but even then, that's kinda weird.