Shadow IT and Private cloud in parallel
The article questions how it can be possible that the enterprise is focussed on building a private cloud, while the staff are also known to be performing shadow IT and procuring their own public services.
I'd say the focus on private 'cloud' is a result of the users demands... and it's a catchup.... the organisations are probably using different methods to block information leakage and use of public services through their network and internet links.
So yes.... both are absolutely happening in parallel