Because I know that there are legitimate ways to make cloud mining profitable, and not only that but in so doing help secure the blockchain on a scale not easily accomplished by the individual, any move to "ban" cloud mining sites who have at least shown that they do have working hardware and can obtain as much as needed for the investors (and yes at least one is out there.. at least one)  should have the burden of proving the miner as a scam placed on the accuser before any decision is made so that the person accusing the 3rd party mining firm must argue and prove that they are indeed a scam (not beyond doubt but convincingly). In the absence of any proof of profitability from the cloud mining entity when requested, an immediate ban would be beneficial indeed, until such proof is furnished at least. If that were enforceable it would make it a lot harder to be a mining ponzi.. but still not impossible.