On one hand it’s nice that we can see all this old data. On the other hand, as far as I remember in the 90s you typically subscribed to a newsgroup and only then got recent posts. So the expectations was a limited life time of the post. Of course it would still be stored in thousands of readers.

Obviously the copyright of each post is with the author. You just assume that you have a right to redistribute.

I’m also happy if I get a pointer elsewhere if you have an url.