It's  not really because you cant  just withdraw the 10$ in  bitcoin  and  you  only earn 0.3 a day which would take you 333  days  to get 10$ with which  in fact is a long time so  if  your  planning on withdrawing soon you might as well deposit your own money so  basically its completely pointless but ya you  still do get the 10$  bonus  a  while  after  sign up.