I've emailed topps' IP to Equity; hopefully they'll terminate his account for his blatant T&C circumvention. Oh wait, he didn't sign up.
Seriously, though, I can remember other sites doing silly things when rake was discussed in chat on the site itself - filtering the word, or warning people that they might get their chat revoked. Of course, a T&C clause is taking it up a few notches.
That said, while silly, I actually don't see that clause as a big deal as long as they don't use it to void winnings or confiscate money. Let's face it, a poker site or any other business can refuse to deal with you for any reason they like - excepting discrimination based on race, gender, etc. of course.