Yes it is a cloud mining service. I lost around 0.5 BTC. I can see people yelling on their Twitter/Facebook, I trusted them because they WERE owned by Bitmain. And later I realized Bitmain was no longer affiliate with Hashnest. Such a terrible moment
Is 0.5 BTC that you invested with them or is the profits that I got? If profits are impossible to obtain with cloud mining, which means that you have been scammed, but if you had invested in them, this money was enough for you to buy some mining hardware at the present time.
Anyway they have a long scam reports here --->
https://www.trustpilot.com/review/www.hashnest.com so it seems a legitimate company in the past that turned into scammers