When I think about cloud mining what comes to mind is an exit scam.
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The one you mentioned are an example of a literal ponzi, there are some legit cloud mining, you can call it as renting miners too. But because mining is not so rewarding right now, hitting your ROI is lesser to happen because most earned funds will go to maintenance fee, etc.
The site OP mentioned is an example of ponzi too, its too good to be true.