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?
Most ISPs don’t do that, content owners do then send complaints to the ISP who forwards them to the user. ISPs aren’t going to spend money on losing a customer.