What concerns lie ahead as more organizations move to public cloud?

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CEO in Services (non-Government), Self-employed
Cloud provider outages are happening more often and it's not just AWS. All the big cloud providers are having outages and failures. Cryptocurrency operators, particularly some of the proof of stake networks that are big up and comers, are recommending that validators on their networks use EC2 instances as their capability. But what happens when the cloud provider goes down and brings down half of a country’s economy because the cloud is the back end? Are we looking at these things from a pragmatic point of view? Are we considering whether resiliency will be the next big issue for the cloud providers, or crypto providers? It's not about who the validator is, what they're validating or the growth, it's about the backbone and infrastructure.
Head of Security and Compliance in Software, 51 - 200 employees
There is a concentration of services on the public clouds, so anytime you see an outage impacting dozens of eCommerce companies, it's not necessarily just impacting the blockchain. The problem becomes magnified to the point that it impacts your national economy and currency; the financial system itself could be brought to its knees.
Senior Director, Information Technology in Services (non-Government), 501 - 1,000 employees
Security is always an ongoing concern. Just like a hack of Experian can expose the data of 15 million people, the wrong type of breach at a cloud service provider could have a dramatic impact on thousands of businesses at once.

Semi-related, I also think that the lack of required skills at many small to mid-size organizations is a concern. People with enough knowledge to implement a system "in the cloud" but not enough experience regarding best practices for security or backup needs are a risk that many companies don't even know they have.
Director of IT in Education, 1,001 - 5,000 employees
Inadequate technical support & sluggish response times.  Fewer local controls
Manager in Education, 501 - 1,000 employees
The intrinsic benefit of the internet -- that it is capable of routing around damage -- is being obviated by the intensive concentration of services in monolithic cloud provider environments.  And these environments become ever more tempting targets of attack as they grow in scale and scope.  The eggs are truly being condensed into fewer and fewer baskets, which are becoming more and more attractive to the foxes (bad actors) out there.

Putting aside the risk of attack by outside forces, customers of cloud providers are increasingly prone to unexpected price increases foisted on them by the near-monopolies they have rushed to patronize.  While we see economies of scale now, who's to say our handful of successful cloud hosts won't decide to hike costs when we least expect it?
MSP & IT Director in Services (non-Government), 2 - 10 employees
There will always be ongoing security concerns. In addition , cloud provider outages and redundant uptime , getting experienced and reliable support… costs of everything mentioned. 
Director of IT in Manufacturing, 10,001+ employees
Data security and compliance 
Director ERP Management in Travel and Hospitality, 1,001 - 5,000 employees
This is an interesting question. You move your servers and on-premise apps/database systems to public cloud, you get rid of your local data center and some of your IT staff, what happens now if you want to bring your data and apps back to your control, almost impossible. Once all of your mission critical apps are hosted in public cloud, your business depends on the cloud, the provider can easily up charge the cost of resources and you don't have much to say. These are couple of concerns in addition to security and other common ones!
Head of IT Operations in Healthcare and Biotech, 201 - 500 employees
At the risk of sounding crazy, I do think there is a concern that large cloud providers who also operate in similar industries as their clients, could leverage IP from clients to use for their own market advantage.  
CIO in Construction, 1,001 - 5,000 employees
Data Security and service resilience are the major concern while moving towards Public cloud.

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