The problem is that all of these cloud mining services are not profitable and cannot make you ROI. Better to invest in a mining device like S9.
The super duper best option for people is to avoid mining in its entirety. In no shape or form has mining managed to come even close to the returns people booked by just simply buying crypto. Mining is nothing more than a fantasy of people to earn passive income, while the majority of the people throughout the years never even managed to make one single penny in profit. Antminer S9 costs $2000, so instead of buying a miner, invest $2000 in Bitcoin, or basically any other top tier altcoin, and wait. It requires zero effort once you bought your coins, and there is no headache because of all the variables that come with mining, etc.