Nearly 20 years ago we used to install monitoring software to tell if a user's mouse or keyboard hadn't been used in a while. More and more places use traffic inspection "for security". Desks now use sensors to tell when warm bodies are near. Doesn't matter whether you're working from office or in the home, surveillance is here to stay. Good businesses should only care if work is getting accomplished. Bad businesses…
Meanwhile in 2023 a favourite argument of management who want everyone back in the office is that it's essential to have those casual interactions around the watercooler. When of course your keyboard and mouse won't be used at all.
Watercooler surveillance requires physical access for cameras and lip-reading, https://news.ycombinator.com/item?id=36188381