Bitcomine or Bitminer.io are pure examples of ponzi schemes.
Indeed, it's not cashed out problem, but scam problem due to lack of information in the first place. Many newbies fall to this trap and come here to ask after it's too late. for Op case, do not pay anything to admin if they ask for it.
Even top cloud mining sites like Hashnest, Hashflare, Genesis Mining cannot make you any ROI on current difficulty conditions so stop trying as you won't succeed.
Since the difficulty increases significantly in the last few months, it may be right. It seems like a double edge sword, you can't achieve ROI with small hashrate in cloud mining, but the risk to buy a big hashrate has the same problem. In this case, better to invest a big amount or not at all.
But then you think: 'ahh, it's better to buy my own ASICs'
Hold on, check the difficulty. You can't make enough money to pay electricity cost with just 1-2 S9 in a few months later due to many companies/group will get into this business and starts their mining farms such as terraminer, icerock mining, hydro miner, but GMO cloud mining may be the biggest fish in the pool if their ICO success as they have developed 7nm ASICs chips.
https://news.bitcoin.com/japans-gmo-launch-btc-bch-cloud-mining-service-august/
We will see the difficulty spike in this year for sure.
