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I would argue that desktop software capable of doing this (storing and using past pixel values to calculate some sort of output) violates the principle of least privilege, so that an OS that supports this kind of screensaver being possible shouldn't be used for sensitive data, even if that particular screensaver is disabled.
Better to harden the OS so that programs (including screensavers) can't access and store the continuous screen output.
That's one of the problems we have with Windows Recall. We don't even want the OS to have the capability, because we don't want that data being copied and processed somewhere on the machine.
I thought it'll just keep a tally of the brightness of each subpixel. not like how bright they are at each point (ie, a recording), but just store their sum and how long was it "recording" to get the average of each pixel. still has a safety concern, but it'll be hard to extract usable data, beyond which programs I'm using. make the running average for a week rather than a session, and the best you'll guess is which program I use the most.