Relevant part:

Huge cursors in GTK4 apps

This problem is already fixed in the main branch of GTK 4, but it’s not backported to 4.16 yet, probably because the fix uses a Wayland feature that Mutter doesn’t support yet. So at the moment, your only option is to use a different cursor theme whose “nominal size” and “image size” are equal.

I might be missing something, but the problems seem to only be scaling issues. Why would I have the same issue on a system with 1x scaling?

Edit: nvm, apparently my system has 1,25x scaling by default

On iOS you can enable Guided Access and restrict what one can do, for example disable touch and lock it to an app, until you enter a Code. I imagine Android will have something similar.

This obviously doesn’t protect against electronic forensics, but it does protect against just opening different apps and searching through the phone manually.