An employer owns your productivity, not you for the 8 hours (or whatever logged time) you work a day.
"Owning people" in the classic sense (even during limited periods of working hours) is slavery, and that's not legal (any more, at least).
Through over 20 years of work in IT, I've learned that managers get this wrong far too often. Even performance reports are direct evidence of deep breaches of personal rights.
The model of employees not being able to use personal time as guaranteed by law, Surveillance tactics, hostile work environments, etc... have all been rampant in US culture forever.
If you're entry level you're a beast of burden, and deeply entrenched in proving yourself and solving critical problems, also at the mercy of accountability and almost always underpaid... At the "trusted top" they're playing golf on the clock and getting golden parachutes even if they under-perform... There is a better balance than this.
Now I'm not into a chaotic work protest as much as anyone else, but the truth is that even the poorest and least powerful masses can overwhelm and conquer any small handful of wealthy elites if they say "Let them eat cake" as history has shown...
We're facing a huge breakdown of everything that makes the world work unless people re-align their perspectives of equality and fairness in labor, and it's a lot bigger than just a few employees unionizing.
Employers own the productivity that employees agree to delivering, and if there is a performance issue, then there's already plenty of precedent to handle that. Expecting an employee to work every minute of an 8 hour day is insane, and not remotely realistic, even if they are a horse.
Employers adding surveillance to the mix only highlights the encroachment of the slave owner mentality in employment, and it could easily create a lawsuit over mis-use and abuse, and it probably will end up in court soon in a very public manner.
It's probably the USB "self-moving mouse" that created all this hype to be honest, but it's still a necessary move for many.