There are some cloud mining sites that are genuine like the ones you have researched about but be careful.
If we look through this cloud mining market, there isn't such a thing as genuine mining services, because all of them know that the far majority of the buyers won't see even 50% of their initial investment back. Those who do manage to ROI, are amongst the very few ones having had just pure luck. In other words, cloud mining is just a waste of time and money.
Its most times too difficult to trust them completely. Some trusted cloud miner have surprisely turned to become scammers.
Point is that you
shouldn't trust them. Even if certain services are actually mining, they are still just gaming their users. It's a scheme that people throw themselves in, and they can only blame themselves for that. It's a scam infested market all the way through, so no one should be surprised to see whatever service shut down or run away. Cloud mining just like gambling is the poor man's attempt to become rich, and this only works against you.