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Well, expanding from that other thread:

It is not so much losing control over the IP as a simple issue of law as written and basic etiquette.

WotC does not have the rights to distribute those adventures.
By copyright law, those adventures may not be distributed by anyone as written, including the authors or people who may have copies of them.
Advocating copyright piracy on a public forum is generally rude, plainly stupid, and exceptionally rude when done on the forums of the company whose material you are looking to pirate.
As such it could possibly default back to loss of IP control were someone to go into court, point at the message boards, and claim WotC did nothing about people openly pirating their material. (Maybe. Copyright and trademark are pretty hard to lose these days without multiple serious blunders.)

A simple analogy:
"Please do not try to organize a bank robbery in customer line of the bank."

Ultimately, however it parses out, WotC cannot provide the adventures, others should not provide the adventures, people should not solicit them, and if they do not knowing their status others should inform them of it politely.