It's a chance to beat them at their own game!
This is a pretty well known angle to pick up extra cash, like gaming credit cards.
http://www.thepennyhoarder.com/bank-promotions/
It just so happens, that this particular promotion has very easily met requirements. You don't need to have a bunch of direct deposits and so forth, which you usually do.
Just don't fuck up and forget to do the requirements, or overdraw your account or forget about it, blah, blah, blah and you'll be fine.
Obviously, when you are done with the account, CLOSE it, just don't spend the last money and leave it there.
They're hoping you will do one of those things, or even become a long term customer.