“Free” product competition strikes again and the latest casualty is Weight Watchers, whose CEO recently left the company in the midst of the onslaught of free weight loss and fitness applications. Finding a killer strategy under these circumstances can be an elusive quest, as Weight Watchers has clearly discovered. In response, most companies hunker down and do more of the same — throw in a price cut, tweak a product feature, launch more advertising — and hope for the best. Yet, they often ignore the one obvious strategy that could give them a serious break: Meeting “free” with “free.”