Cloud mining actually encourages centralization. If gives the cloud mining company are larger presence and the "gift" of your purchase allows them to either build or buy their own private farm which they make a profit off of and then "offer" to you 3 months after they made their share. Rinse & repeat.
Well that may be true, I'm not a professional nicer and i can tel you that i won't know what to do with my equipment if i had it deliver to me. but i can tel you that i did make money on my contract on nimbus they where the only one who did not have more fees after you paid for your basing and they let you chose you're pool !
any way my experience was positive and i can only recommend them.