It is questionable how winz.io advertises their „free spins with no wager requirements“ and that has been said like 10 times already in this thread.
May everyone try for themselves but don‘t expect to make a winning on the long run because of the freespins.
How can you tell and what was your factor that made you say that their free spins without wagering requirements is questionable?
You know, it is really fine to be suspicious sometimes, I do that also on other site if I find them suspicious.
But I think you misunderstood their promotion. On most sites, free spins or other welcome bonuses has really lots of x wagering requirements, some requires 20x wagering requirements before the winnings/bonus can be credited to your balance.
It is different on your deposit, in which I think most sites (if not all) will require you to at least wager your deposit 1x. I believe this is to avoid money laundering and other illegal transactions.