Pretty much everyone got scammed by GAW, it was very well done con. Also dont go all in from start but try with small amounts like $50-100 only to start or whatever you can afford to loose.

Signs of scam

1) no daily or regular payouts or minimum payout limit or fees on small payouts
2) discount on bulk buys or options to buy with mining income(eg hashflare although they seem legit)
3) delay in support request
4) no social media presence
5) no proof of h/w (thats why i am cautious with gigahash)

and after all that there is still chance of scam if you luck is bad. Also no matter how cumbersome it is always read the contract or at least do a quick search for fees & termination.