Looks like another effort to stay "under the radar" of the US banks. Perhaps this three transaction limit is more than temporary.
They certainly stand to lose, especially if it is a sports bet players were going to place with the deposit, the event could be over before the deposit limit is lifted.
I never received notification of any "temporary changes", although as a non-US player I can use Neteller for the odd $100 they get from me - still no random jackpot though