And just why should cloud mining be excluded and is that even possible as long as you make the coin possible to mine with CPU?
Cloud mining runs on centralized facilities, so it creates vulnerable areas for attack. It also concentrates distribution, wastes electricity, and results in instamined coin. This happened with Protoshares, which was supposed to be highly decentralized CPU mining on individual PCs, with mining slowly ramping up.
As to if its possible - good question. Maybe if there is a way to detect and penalize clustered CPUs and verify diverse geographic location.
Another option is if mining is tied to useful activity like providing bandwidth, general purpose processing power, memory, and storage to the network, using the coin to optimize resource allocation with market driven supply and demand. In this case, the more mining power, the better, regardless of source, since everybody benefits from lower cost, higher capacity, and ubiquity.