MCiOS is located in outer space, so will also duck the legislation. It's possible that OFCOM will set a threshold of as to what constitutes a 'significant' number of users, which I am sure we'll fall well below, so maybe we'll not be affected after all. On the other hand, the fact that each and every word we post is visible to the entire universe, maybe we will.
Well, given that every participant passes an exam (aka Cymraeg Epistolariat) and can create and close forums at will, one can only conclude that everyone is an approved moderator and thus exempt. As for exposing the tender masses to the awful, pornographic reality of wordplay and transit stations, well; I've been at some pains to discourage spidering. I don't see how someone with the brains of a modern UK cabinet minister is even going to find the place.