I looked at the Wikipedia entries under "mountaineering" and "canyoning", and found links to websites of user groups similar to CGoaB. They had forums, journals, classifieds, adds by google, and logins for members. Some were run by associations, and hence required a subscription; others by interest groups. What stands out about CGoaB is the artisanship of the website design. Wikipedia apparently feel that anything that looks this good must be run by a commercial entity. Who woulda thought that sophisticated Wikipedia would judge a book by its cover!