[cf_]

Yes, the same could and has been said about YouTube-dl. It depends what you do with the tool. If you are using it to download videos that specifically allow this, then there is nothing illegal about it. It's the same thing with a hammer. You can use it for legal or illegal actions, but that doesn't make the hammer an illegal tool...

[LarvaFX]

By watching videos or listening to videos, you make a non-digital copy of it in your mind! Is that legal? If you hum the song, is it illegal reproduction? If you describe the video to a friend, is that unauthorized reproduction? If you formulate a critique of it, is it an illegal derieved work? Who gets payed in these cases?

[IndySun]

Here comes the hilarious twisted language to justify 'sharing'.