I also think they are the most profitable ones but they also have the biggest risks in my opinion, and you can say without risks no profit that is true but it depends on how big the risks also is of course.
They are just getting reputation more from other people to make more investors in their website.. so take care block halving is too near and one month to go..
Cloud mining is ponzi scheme and will turn scam someday, and the famous of them is hash ocean and surely 100% very for this state to invest for this time since it gives us to much low roi and we cannot get our capital back easily we will count for many months to get back the capital and we cannot really tell if we can get back our invested money for them,
And really the really fact about mining is not profitable now since blocks is difficult to find now thats why theirs so many miner dump their hardwares and other mining companies need investor to survive.