That's just an actual use case that their true customers would pay for, I think it's awful and should be illegal under any reasonable worker protections but why would they not advertise it this way privately to business customers?
I also don't think it's cynical to think that a manager looking for a reason to get rid of someone will have a much easier time justifying a PIP or just straight up firing someone if they can retroactively have an AI do it for them.
Why wouldn't they be able to ask the system "how much of <employee they don't like>'s time do they spend doing things on the computer that are not directly related to <company name>?"
Is it technically happening already? Sure, there's nasty nasty spyware being forced on people and it is awful and I hate that those employers are getting away with it. But integrated into the OS, on by default, with a long memory? Just imagine how easy it will be to fire anyone that tries to unionize in an effort to fight against such surveillance.