system
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But that’s not the perception of most viewers. If you need a “how it looks like”, there are enough screenshots out there. If you need to see the behaviour, then test it with EICAR.
Of course you can also see those aspects in a youtube video, but probably most viewers would get to conclusions about the quality of the tool from the “percentage” of malware caught in the video; and basing the evaluation on the result of these videos is inaccurate, at least.
It might be a little bit useful for some potential users, up to some extent. It is not an “objective” meassure.