Ironically, almost none of the cloud miners show any real proof. Moreover, pictures are no proof at all as those can be easily faked. But 2 reasons of not showing proof are acceptable...

1. Most countries dont have clear bitcoin law. So miners dont want to invite unnecessary problem by revealing their physical location.

2. Most large miners sell block to mixer services as those have a premium price. So, most of the time cloud miners's payment come from customer's fund, rather than generated blocks.

Hahaha, with all referral links No intention there 

I have read stories that people invest in BTC Jam and people run away with that money. On complain BTC Jam simply declares that they have nothing much to do and investors need to team for lawyer fees etc. So I think, there is no extra advantage in going through these platforms.

Cloud mining is a double-edged sword. You actually get the hashrate pretty fast and don't have to care about the hardware. Then again, you still won't make much of a profit, probably. I believe ASICMiner's new cloud mining (AMHash) on Havelockinvestments is pretty reliable and at least trustworthy, you can buy new shares since they're currently IPOing: https://www.havelockinvestments.com/fund.php?symbol=AMHASH2

no good from cloudmining.

Stuff like cex.io is very unpredicatable and it is gambling basically. Just wanted to tell you all.

Difficulty cannot be estimated in the long run. You can only try to estimate the next difficulty increase but it may or may not be accurate. In a few months after buying the GHS, the difficulty may have rise as more ASICs are being shipped or big farms coming online. If that happens, you would profit much less from your overpriced GHS from cex.io and you can't sell it for much value as the price would be lower.

If you like to ROI, don't bother

try to get into hashprofit.com, you just sign up and enter the deposit some BTC, and you can get in the cloud bitcoin mining in accordance with KHS you buy, the system you will be given hashprofit profit estimates will be obtained, and how many months it will return on investment , may be an alternative investment your bitcoin ... 

Better stay away from those who offer things completely free today, because tomorrow when u invest big they'll run away with those funds. Everything has a cost. Those who are asking for at least small investment today are more likely to stay tomorrow...

Just my 2 satoshi