Unfortunately, the privacy model of an IRC private channel is only as private as the privacy precautions taken by members of the private channel. Someone could

Unfortunately, the privacy model of an IRC private channel is only as private as the privacy precautions taken by members of the private channel. Someone could run a ZNC bouncer on their own server, and have it connect to Freenode. Then, they could connect to their own bouncer using the IRCCloud web client - effectively gaining access to Freenode via IRCCloud, and Freenode would never 'know' IRCCloud is 'listening' in on the channel.