Look, employers are always free to – and should! – evaluate the work product produced by employees. But they don’t have to surveil someone’s every move or screenshot their computer every five minutes to do so. That’s monitoring the inputs. Monitor the outputs instead, and you’ll have a much healthier, saner relationship.
If you hire smart, capable people and trust them to do good work – surprise-surprise – people will return the sentiment deliver just that! The irony of setting up these invasive surveillance regimes is that they end up causing the motivation to goof off to beat the very systems that were setup to catch such behavior.