Quoting D.F. Manno:
Will McGugan wrote:

When you post on newsgroups, the text gets sent to numerous news servers
around the world, to mailing lists, and to web forums. You have to
consider your words to be in the public domain, even if someone else
seems to be profiting from them.

No, nothing is in the public domain unless you specifically put it
there. For someone to profit from the use of my Usenet posts is
infringement on my copyright.

What are your feelings on Google Groups ?