You have a camera aimed at your face when typing this nonsense post.
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Not everyone is on their phone, or a laptop.
On a site for tech enthusiasts, there are a shocking amount of folks with very "tech is what you get at the Apple Store" mindsets about.
Nor does everyone leave front-facing cameras (or any device camera) uncovered.
There's no minimum fidelity required, you could use potentially any sensor to surveil. It's a question of use.
You have a camera aimed at your face when typing this nonsense post.