Pictures dont mean anything. You have NO idea much or how little hashing power is being shown, what pool they are mining ect. GAW looks like it has gone full ponzi, CEX is too big for its britches.Genesis Mining´s owner seems like a genuine nice guy, still doesnt prove much.
PB= No pictures, No workers , just payouts - no big suprise
bitcoin-trader.biz= yes they also had cloud mining, if a company is giving away 20$ to everyone at a conference, then you might want to think about why that is.
All others= PONZI UNTILL PROVEN OTHERWISE
At inside bitcoins paris I asked the mining panel consiting of Genesis Mining and Bitmain "how can we audit cloud mining companies" Bitmain said that there is no real way to do it, they do not disclose informaiton about orders unless the client wants them too. Bitmain rep Yoshi also suggested that companies could point all power to a pool for a few seconds to show power.
Genesis understood the reservations people have, invited them to vist any location (of course at your own travel costs). Also pointed out that pointing to a pool as described could be a disatvange since other mining companies would see exactly how much power they have. The total minng power is kept secret for tactical reasons according to Genesis.
There is no way you can ROI at CEX because of fees, you could trade GH, but that is trading not mining.
Probaly better off not cloud mining , buying a set up for at home and learning how to use it, if you are able to sell your mining gear for an ok price when you want to stop mining you might break even, this of course depends on how much your power costs per kw/h
You could also make a deal with someone you trust if they have cheap power and have miners sent to them. More work, but a lot more learning about mining and crypto.
