The fact is that cloud service providers (CSPs) at any kind of scale have more network engineers, security engineers, compliance experts, and operational personnel than most companies that run their own data centers.
John Purrier quoted in The Roles Cloud and DevOps Should play in Your Digital Transformation [enterprisersproject.com] on The Enterprisers Project
This will be the single biggest driver in moving to the cloud in the future. Even large enterprises have proved how bad they are at security —looking at you Sony! The big cloud players will be the ones who can bring these services at the most capable, most professional and most cost effective level to all companies from startups to mega multinationals. Why should every company have its own IT Security team?