It is not new. I downloaded (copyrighted) porn movies from my ISP's own Usenet servers in the early 90s. On dialup. It was a decentralized, federated service before anybody even knew what decentralization or federation even meant or why they would want it. It was just assumed that everyone would want to run their own Usenet servers because the technologies of the time didn't allow direct, continuous, real-time connection between everybody. Sharing was expensive but running a Usenet server was relatively cheap and was a good way to share all that data to all of an ISP's users at once. It was ALWAYS an option to use it for piracy, and people did.

Nowadays, sharing is cheap, and running Usenet servers is expensive, so almost nobody runs their own Usenet servers, especially not ISPs. But that's not the technology's fault, it's just the way the world has changed. The internet is a very different place now, and we use it in different ways. Usenet, on the other hand, has not changed at all. Only the people using it have changed.