As the most of the cloud mining sites even cloudminr.io did not disappointed itself. Powerful beginning, very good rates to tempt the customer, totally anonymity in order to be safe in case of everything can be happen (maybe a civic address which in most of the cases is a fake address), a good service customer in the beginning and then forget it. In a few words things that are seen to many times (almost all the times) and again people who join on those. What is the meaning of this? It will be the hope so strong to overcome always the stupidity?
Not much hard to spot scams like these specially with all the warning signs on the forum everywhere.
Are they coming back??
I really doubt it. If they ever come back, they'll come up with a new name. I have the perfect name for them: scaminr.io
Unfortunately even if they come up with a new name, it will be hard to keep new people away from it. They have a common trend, starting with a signature campaign and spamming the forum with their ads. Then offering bonuses and sign ups to increase the number of people buying their packages.