According to Gartner, global public cloud services revenues are to total $186.4 billion in 2018-- a 21.4% increase over 2017 revenues worth $153.5 billion.
The fastest growing segment is IaaS, forecast to grow 35.9% in 2018 to reach $40.8bn. The analyst expects the top 10 public cloud providers to account for around 70% of the IaaS market by 2021, up from 50% in 2016. Such dominance of hyperscale IaaS providers creates both "enormous" opportunities and challenges to market participants, since while it enables efficiencies and cost benefits, organisations need to be careful of providers gaining unchecked influence over customers and the market. In addition, organisations should demand simpler ways to move workloads, applications and data across IaaS offerings without penalties.