Of all of the "cloud mining" offerings out there, Genesis comes up the most legitimate operation, time and time again.

Yes their Bitcoin mining contracts are "lifetime" and are very difficult to get, however, they also offer other mining contracts that are typically 2 years in duration and are sold as Ethereum, Monero or some other type of crypto mining. Once purchased, customers have the ability to redirect their hashing power to any number of cryptos that Genesis supports the mining of.