They invest cloud mining, sites that doubles BTC and of course gambling are the mistakes committed by most of the newbies in BTC. I don't really bla,e them cos many of us threaded this path on our way to becoming professionals
Yes, invest in cloud mining service will be difficult for return of investment although the cloud mining service can be trusted
but invest in cloud mining are bad ideas because the cast of mining is very expensive and the difficulty of bitcoins is increasing
every time and risk to be scam service can happen.