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That is a normal thing to feel.. but think it like this the more a cloud mining platform/operation/company is sharing their information ...contact, real people...and sometimes even location the more you can trust the site.I will never be 100% thrust but it can be added and increased.
For example the Bitcconect scam/ponzi they put information and shown their faces....now after their collapse....people are making massive lawsuits against them.
And believe me this is still not over....the lawsuits are piling up and up .
After that ponzi Bitcoin suffered and went down...now it recovered but you can see the Domino Effect that Bitconnect made.
Making a ponzi company now and show information with the public then scamming out will be very difficult as people and lawyers "are out for blood"
Of course that doesn't stop some people but it most certainly will decrease them.

I hope that now you can at lest sleep more good after my explanation!

It never hurts to look for more information and think 2-3 or even 4 times before you invest in something .
And if you already invested remember that you are a human being that has rights and if someone/company breaks you rights, you have the right to take Legal Action against them.

I certainly will.
Thank you so much @cynetyc.