thread locking spree in one section?

Maybe it's normal for your forum, but just in case, I noticed someone went on a bit of a spree on locking all topics older than a week in this section Call of Duty 4 - Modern Warfare (MW) Hacks - MPGH - MultiPlayer Game Hacking

is it normal? if so, why? seems like a silly routine.

Old topics that are one week older are supposed to be closed.