[HugThem]

Lots of confusion in this question. Where do I even start ...

First of all, what do you mean by "this"?

You mention Napster and Limewire. These are things. Things cannot be illegal. Actions can be illegal.

A certain action is illegal if there is a paragraph in the applicable jurisdiction that forbids it.

It might be illegal to manufacture, own, fake, destroy or distribute a thing. But a thing on its own cannot be illegal. What would that even mean.

So who did what, which jurisdiction is applicable and which paragraph forbids it?

[BRedSox]

Let’s start with number one. By this, I mean the act of publicly posting music for others to listen to for free without paying the artist.

Edit: You have since edited your comment but let’s still start there.

[croo]

Uhh, is youtube-dl a thing?

[_jal]

Yes. Much like the RIAA, you are confusing distribution with ownership.