...So, you skip the ads using an external program, which prevents the youtube channel you're watching from getting their money.
That's the part that makes it piracy. Of course you have the right to do this, I have no ethical problem with it, i'm doing it now, but you have to understand that when you're doing this you're preventing the youtube channels you're watching from getting paid, you're taking their content without paying them what they asked for in return.
If the youtube channel disables the ads themselves, that's one thing, but you not watching those ads is not what the youtube channels want... because that's how they get paid. Getting free content without paying the content maker is... piracy.
