I wouldn't go so far as to call cloud mining a scam, but I will never touch it again. I did a fair bit of cloud mining back in the day (@2014) and all three of the cloud miners I used dissolved. I assume their equipment became obsolete, they unplugged their machines, and that was that. If that money had gone towards topping off my other investments (the ethereum presale, for example) I would be much happier today. Of course, conditions may have changed, but I seriously doubt it. In short: there are better places to put your money.