About two weeks ago Binance had a giveaway of free hoodies to users who submitted a general questionnaire explaining their opinion about different functionalities of the exchange. Considering that they recently gifted a $10 voucher to anyone completing KYC identification, which can be spent on trading fees, and the number of these beneficiaries had to be in the thousands at a minimum, and possibly higher, it doesn't seem a comparative larger burden to giveaway a few hundred hoodies.