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Have you been using windows in the past 5 years?

Accepting random binaries from the net and running them is the main software distribution model.

I am talking about scenario that "a friend" gives you binary to run. It is different from downloading software from a trusted source.

This is not a random friend giving you a binary. This is where you asked a trusted friend to build you a binary, and he delivered it.

Someone could simulate your trusted friend, that's my point.