It's a common question made by who is new in this world, and the answer is always the same, it's a scam.
If you see about the genesis mining and hashflare it looks like the legit cloudmining site but it will never give back your ROI and it's also including on the scam site.

Included on which scam site list?
I think both have been around long enough to survive. And isn't genesis mining part of the Winklevoss exchange genesis? They are the one's creating the bitcoin ETF. So they will only run if their ETF fails to get approved and then their exchange of bitcoins loses enough money and goes under.