I recently came across a torrent that seems to be an archive of Reddit. It got me thinking if it would be possible to make it locally browsable. However, I also considered the possibility that someone might have already addressed this by creating a public Lemmy instance, enabling the content to be accessible from any federated instance.
They only copy posts afaict. I subscribed to some of their communities but unsubscribed rather quickly as the post feed without comments usually has little value.