I know YouTube is a terrible provider of pirated content and also that it is almost impossible to pirate without a VPN, but I would like to know: if I download a movie from YouTube (directly from it, of course) without a VPN, will I receive “that type of message” from my ISP?
You should not. The biggest thing that will get you in trouble is the uploading portion of torrenting, which is why it is always recommended to use a VPN when torrenting any copyrighted content.
In your case, the traffic will roughly look like you were just watching the movie on YouTube, just really fast.
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