there is no enough info but the video above is kinda a good proof
It's a pretty old video showing nothing but a mining farm, where nothing even remotely hints at them actually owning all that, or even a small part. It might very well be that they just host a few miners there, and that's really it. They refuse to publicly show their mining addresses, and that alone is a sign that something shady is going on. If they were really a major party in the mining industry, they would be visible as such, and also have some sort of saying over the process, but nothing of that to see.
but the whole concept is shady , like personally if I had mining equipment that making me good money why do I want it to offer them for other customers ??
the only reason that makes sense is that if it's more profitable for me if I let people rent my devices
The thing with cloud mining is that mining farms who are mining anyway, don't actually pay people out with mining rewards, but they pay people out with their own invested money. For example, if you buy 1 BTC worth of contracts, they will slowly give you back small chunks of that 1 BTC, but not enough in order to be able to walk away with profits. Their terms are set up in such a way, that probably +90% of the people will have their contracts terminated far before they reach their break-even point. In other words, actual mining farms earn their mining rewards + people's investments in cloud mining contracts. It's a win win situation for them.