I don't think so. There are a lot of complaints about airdrops too. On FreeBitco.in, on the other hand, it's not $0.002 worth of BTC every hour which is attractive. Spending very little time for visiting the site you have a chance to win $20 or even $200 while risking nothing, and that's what is engaging. Also it is important to note that they pay their winners regularly unlike many other sites who only promise big prizes but then don't pay out.