I wouldn't argue or doubt this cos most of their promotions and giveaways have been in real fiat other than their tokens. These are stuffs most projects don't consider. I've won some project contest that became completely useless cos I couldn't cashout in real fiat.
Like they said, its a fund for your project not just a reward. Its a gift to the winners so they could go on and make their dreams come true. Its not money for their purse or a free gift or money they could invest in a different project not even in Dreamr.
So I guess this has to be in some easily liquidated currency. And bitcoin would do that better than gift cards would.