Of course, some of these sites may fall by the wayside but I've been doing it for a couple of weeks now as a test and have already withdrawn my initial investment so I'm break-even at worst and only playing with profits.
The bottom line for me on this kind of business is that, you might be enjoying it while it is lasting. At the middle of your high hopes, you might find out that some icons might be disabled and you won't be able to make further progress on withdrawals & etc, meaning you won't have a means to withdraw whatever you have with them. I generally see all that as ponzis. I have been there, is just an advise my friend. Enjoy it but be careful.