Its not a scam, its the biggest cloud miner in the world. However, you can't make money out of it anymore. The online bloggers like boxmining and cryptonick talk shit about how profitable it is, but they make good money off of your referrals. With the difficulty increasing daily you'll lose 2-3% of your payout each day and will not get ROI. Better off just buying the coins you like and sit on them -

Please read my story if you suffer from blockfolio addiction too? - https://steemit.com/cryptocurrency/@cryptocoinclub/confessions-of-a-blockfolio-addict