Hasnnest and bit-x, make it simple, the other forget about them
but even on the legit one the roi si very hard to achieve, but at least they pay you, it's better to do some trading with your hash if you want to earn profit
Yes, even for this trading you need to know very well what you are doing. If you are a newbie, I would advise staying away from the cloudmining altogether! The chances that you will lose some money on the long run are quite high!