I'd suggest that freenode's arguments seem to be fairly hollow given that freenode as a network is populated by tech savvy users and if they want to cause strife on the network, then the client they use wont make much different, they will find a way.
I personally find it incredibly convenient that axod writes a post about mibbit's revenue that is posted to HN and then the next day, mibbit is banned from freenode but that's ok, freenode has implemented their own webchat client that you can use. Great timing no?
Given we've established that people trolling freenode will find a way to do so regardless, that could be construed as a little fishy, no? Especially since it's just a default installation of an open source client - it wouldn't surprise me if ads pop up on the freenode webchat client in the next few months.
I also find it interesting that even though axod was in channel asking the #freenode ops what he can do to fix the issues and the general response was "sorry, it's done now" - stonewalling him only lends weight to my argument.
Don't get me wrong, I'm all for freenode trying to make money to support their servers, but at least be transparent about it.