You didn't tell that each survey gives less than .01 BTC. The ones on there are like $0.50 worth of rewards for surveys that you might not qualify for.
where does it say that??
This is a rather surprising reply. Where does it say that? Have you even registered there? On the survey page, every available survey you can take is less than 0.01 BTC, in fact, they're less than 0.005 BTC.
Or did you just make an account, not look at anything, and try to referral spam like every fucking BTC related thing these days and think you can make tons of money that way?