Correct. I do not have any other cards that do this. During this month I have stayed at various hotels and the pre authorisation has always dropped off within 48 hours if not sooner.
Note that the pre authorisation is a hold that the hotel is able to put on its expected final bill, not an actual charge. But it has the same effect on your credit limit as if it were an actual charge - namely, it swallows up your available credit until the pre authorisation drops off, meanwhile leaving you with less credit available. (Why not simply apply for a higher credit limit? Because when someone wants to look at your credit score, eg if you want to apply for a new card with a sign up points bonus, they will assume that all your credit cards are maxed out before they make the calculations about whether your income is adequate for whatever purpose they are looking. It doesn't matter if you're the sort of person who pays off cc's in full every month without ever incurring interest. So the aggregate credit limit of all your cards is not something to increase just for the fun of it).