I agree look how much BTC as grown since this article was written.
There is a Christmas 10% bonus program going on right now. I didn't register with it so I missed out on the 10%. I am kicking myself. You can do your own research but hashflare is a winner. Here is the promotion link.
ONLY GOOD FOR NEW ACCOUNTS
https://hashflare.io/r/4CEE3C8-christmas
In all fairness I get a referral bonus but you get what I didn't.