I think you can simply “focus” the desktop, and then launch any screenshot tool, there is no protection for that.
Once it’s in a picture, you can OCR all you want.

Unless you have a program that does just that (protecting agains screen shots), I don’t see the need of any other tool.

You know they want to impose age verification on Linux as well right? Linux is still the way to go, but I am so not ok with what they ate trying to do.