Due to the nature of the thread, What are some examples of a mathematical result being counterintuitive?, I think the normal protection procedure shouldn't apply. It's a big-list type question where there's no real limit on the number of good answers.
Although protecting it prevents "thanks", and "me too" answers, it also prevents good and interesting answers by new users. This is not theoretical - already in the thread we have a 1-reputation new user posting a useful and interesting answer regarding the Kakeya Needle Problem.
I can imagine a random mathematician or math enthusiast stumbling upon the thread via Google and having an interesting example months or even years in the future, but being unable to post because they are blocked as a new user.