Can Gigapoints really be exchanged for gift cards, vouchers, even a macbook or a dryer?

Smart suddenly texted me that I have lots of points, I haven't really checked or anything, ngayon ko lang nalaman na may ganto pala. I dont have the Smart app also if that's relevant. What I want to ask is if this is really legitimate? since I saw my points can be exchanged for even an Iphone and a Macbook also Adidas Cash Voucher, paranh napaka too good to be true.