DY’s lashon seems to be a new thing, the book that I am reading says, “can win 1000 times their donation up to one million dollars … Winner has the choice of taking 500 times his/her donation immediately or taking 1000 times his/her donation to be divided over 10 years”
The first part might be somewhat problematic though it says “can” which implies it is only a possibility. The actual prize is described in the next line where it is a clear choice between 2 prizes. Either way, I’m sure they hocked this out with competent halachik authorities.
Also, my book says the drawing is March 9th (a week after the auction which is listed as March 2 which is the Shabbos after purim). DY’s post says May 11 which is the Shabbos before Shavuous and is more consistent with their previous years. I guess either DY copied it wrong or they changed the date from the original official rules.