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I worked in IBM for a bit before Notes and it was even worse. Everyone was given terminal software that connected to some mainframe to read email. The terminal didn’t even refresh so if you wanted to see if you had gotten email you had to refresh it manually. Fortunately I was only a contractor at the time so didn’t get much email although I did get one from an employee apologizing for cheating on me, and a followup saying the message was meant for someone else lol
The EFF has some info about the practice - https://www.eff.org/pages/list-printers-which-do-or-do-not-display-tracking-dots.
I imagine there are ways and means of obfuscating / anonymizing the dots such as blocking the printer from emitting them (e.g. an empty yellow cartridge that the printer perceives as full), modifying the firmware, using a burner printer, or using a mono laser jet.
As a side issue, most modern bank notes have a bunch of yellow circles integrated into the design on each side. They look random but they’re in a recognisable pattern called a constellation that enables devices like copiers / scanners to recognize when people are trying to copy money or other financial instruments like checks.