HYIP = SCAM. period.
Cloudmining though I haven't tried a lot of them but 4 or 5 and 3 of them are still no pay as I putted so small amounts that it takes at least
3 months to reach minimum withdraw limit
and 2 of them paid, hashnest (BITMAIN) however the fee and payout percentage changes
By the minutes but you can ROI there no doubt, and other one is hash ocean where I have 5 family member as my referrals and each
Putted $15 and so far payments are coming when reaching 0.005B. but hey don't say that I'm promoting them because I don't know what happens if I put $20,000 in one account, how ever to this date no one is claiming to lose money to them. but cloud mining is not scam in nature.