They only banned around 50 people, and it was only for 5 days, and those people were clicking the cat 150+ times per minute through pretty much entire matches, for thousands of clicks per match.
Clicking the cat once, or even several times, just plays a flashy animation and changes its color. It's only a problem if you spam-click it like crazy.
Oh, and that's for when it's your own cat. Clicking the opponent's cat isn't an issue at all, I think.