Earlier quoted context omitted.
I think many people would disagree. It might be legal, but that doesn't mean it's not unethical. If a stranger on the street started following me, taking pictures without permission, and taking notes about my appearance of actions and storing it in their database, I would say he was behaving unethically. Ask street photographers - it's a delicate balance. Many people really dislike having their pictures taken without…
That is a lot of words to simply say that some people think it is unethical. Which is an essentially empty statement. Couldn't you at least say most people and make it an argumentum ad populum?
ethical != opinion
Ethical has weight and you can lose your job, and even go to jail for being unethical. RMS actually has a very strong academic ethical mind (Even though I disagree with him more then agree). BUT ethics isn't easily defined.
Here is a decent link to defining Ethics. https://www.scu.edu/ethics/ethics-resources/ethical-decision...