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If it's aggregate stats (assume you meant anonymized), I wouldn't care very much.

If someone was watching me without my knowledge, I'd like quit when I found out. (Or perhaps make their life hell.)

Employers should just fess up and state clearly that they are doing this. It's the coverup that's the problem.

I would decline, if it doubled my salary.

that is invasive, and they don't need the information.

if it was required, I would leave the company.

accept, reverse engineer, if data is aggregated - send spoofed randomised data, if not - just play back time I actually worked on slower speed and use a VM.

As for price, let them make an offer and see how valuable the data is for them.