I won't believe anyone or any platform or any site which will give you free money just like that, even if it's only for 1$, there is always something behind it. I don't know how much dollars that 0.043BTc would give you at that time you posted this topic, but it worth around 2,600$ now. That's too good to be true, I won't bother to do the registration.

Now I wonder, the fact that this kind of scam is still around that means there are some people out there would fall to this kind of scam.