When the Old Man shaking his fist at the Cloud is a former tech lead of OpenStack's Compute project Nova, I think it's worth paying attention. His fist started shaking 4 years ago, but the most recent commit on GitHub was 4 hours ago. The fist is still shaking.

And only because some readers are quick to make assumptions - here is a link to the assumptions: https://shakenfist.com/manifesto/