That sounds like a truly dystopian take to me, but suppose you're right and nobody should ever use their work computer for anything personal.

Per TFA, this thing is literally taking screenshots of what is on the employee's screen. At work my screen sometimes had things such as: performance data on other employees, my own PII from HR systems, PII from customers, password managers, etc. It's also logging keystrokes. How many times do you type passwords a day.

Collecting that kind of information on purpose is truly wild. Imagine the security safeguards you would need just to prevent it from leaking. Wait what, they're explicitly collecting it to train LLMs with it? God help us all.

Your screenshots go to your managers, not just anyone in the company. At Meta there are very strict safeguards for preventing employees e.g. stalking their exes, so I'd assume the same security is used for even PII filled images.