Analysts
So another analyst outfit makes a prediction......
Pretty much anything that is virtualised on-prem is now classed as "private cloud" so then entire statistic starts to become meaningless.
The only thing that appears to matter is that IT can tell management they are using "The Cloud". At that point everyone has a warm fuzzy feeling because they are "on-trend".
Maybe I have just been in IT for too long but increasingly all that matters now is the marketing and buzzword bingo.
Real costs whether on-prem, private, hybrid or public cloud are buried in subscriptions and leasing arrangements.