Do they really mine bitcoins? It is fake, right? But some of us including me has an experienced to invest in these kind of scheme and gladly make a profit with it and I think that's the advantage of it. But eventually they're becoming scam after a week or a month.
Are you asking about Hashnest? If so I can speak for them from my experience:
I am 99.9% sure they're mining. It makes perfect sense for one of the major ASIC miner manufacturers (Bitmain Antmienrs) and pools (Antpool) to mine. If someone wants to help me become 99.99% sure or 50% sure, I could provide you info from my payment history and see if we can find proof of mining. (I have no idea how to prove mining or what it looks like).
But, if you were able to manufacture the best and most efficient miners, would you also use it for mining, in addition, to sell it to others?
A lot of people think all cloud mining is a scam, and ask: If you make your own mining equipment, why not use it to mine yourself rather than sell to others?
ANSWER: Like most businesses that need to grow fast, they have to raise capital. One of those ways are issuing shares to their company. In this case, Bitmain, in order to grow fast and make put their Antpool in the top 3 of global hashrate, instead of issuing company shares, they started selling their miners for cloud mining on their Hashnest website for a higher price than they do on their Bitmain website. These extra profits from the demand for Cloud Mining (from customers with high electric cost), allows them to double their profits compared to selling and shipping the miners, allowing them to raise the capital that they needed to R&D and grow their mining operations faster and catch up with top players and stay in top.
Sadly, since they reached the top 3, they don't sell ASIC miners on Hashnest as often as they used to, which also makes sense... If you think about it, if you are already a top dog in mining and its technology, you don't need to accelerate growth anymore and just enjoy 20% of the global hashrate...
They used to list cloud ASIC batches like 3-5 times a year when I invested in them (back when they used to produce the S1, S3, S4...). Recently they have been barely selling any cloud miners and when they do, they get bought off in a few minutes, causing me to miss out on the newer miners... I believe they haven't put up for sale any miners since November 2016...
Of course, there's the hashrate market, where people trade individual hashes (shares of previously bought miners on the Hashnest shop) of various miners (currently S9, S7 and L3 hashes) using buy and sell orders just like exchange and stock markets. Those hashes do generate bitcoin revenues, but you rarely get ROI. In the market you could make ROI by trading (buy low, sell high). Also if you have enough hasesh of a miner (example 12500 GH/s of an S9) when the miner is not profitable anymore, you get the option of having it shipped to you for a fee rather than it disappearing completely like in ponzi/scam cloud miners.
If anyone knows how to find out where they announce (if they do anymore) new ASIC release dates, or how to sign up for some kind of notification, plzzzzzzzzz tell me! Thanks