To be fair, BattleNet for warcraft 3 is a ghost realm populated now by looping hosting bots and nothing else of much value.
The rules does not specify requirements or deny the use of second party programs to supplement the enjoyment of warcraft 3. Since Blizzard has publicly allowed the modding of its programs and even encouraged it, the usage of programs such as Garena, Hamachi, Game Ranger and so on would thus stimulate the need and life of the warcraft 3 modding scene. For example, had I not been able to use garena or game ranger, I would've probably stopped modding warcraft 3 two years ago.
If a user has legally bought his copy or not is not really any of our concern since we can't really verify the validity of anyones claim, be they good or bad. Thus, punishing anyone for speaking about it would be counter productive.
Instead of dismissing valid alternatives, embrace them instead. It's a much more healthy mindset. We can't change the way the wind blows, we can merely adjust our sails.
However, because of safer internet provider on my end, with decryption and other fancy features, the lan tools I once used no longer works. So for me, battlenet, as sad as it may be, is my only option left as of now.