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bitcointalk.org is not a normal for-profit company. Even if banning iamnotback somehow stopped all future ad revenue, he would still be banned, since his rule-breaking is disrupting the forum's mission of hosting free discussion of Bitcoin and related topics. (As explained above, "free discussion" is not "unmoderated discussion".) Similarly, I would welcome effective competition from decentralized forums, and I would be thrilled to be able to shut down bitcointalk.org in favor of a better-in-all-ways decentralized alternative. But although decentralized forums have existed for a long time (eg. Freenet's FMS is almost exactly what iamnotback keeps describing, and has existed since before Bitcoin), they have unfortunately not been widely used since the era of the semi-decentralized Usenet system, mainly due to vastly inferior usability.