>the cloud hype (the bubble on that is already bursting with companies moving their workloads back to data centers)
The cloud is data centers. Someone else just owns and manages them, and the computers therein.
About 15 years ago I went to cloud computing event. Best line of the day from one of the presenters:
“I used to be an application service provider, then I did software as a service, and now I do cloud computing.”
The room, which had generally been around the block a few times, broke up laughing for a good bit.
'Data centers' imply data centers of individual companies, not data centers of cloud providers. Data centers of cloud providers are simply referred to as cloud.
The issue is cost. Cloud providers baited companies with attractive promotional pricing into getting rid of their data centers. Once the promotional pricing expired these companies were in shock at their cloud bills. Not what they had been led to believe. Lot of articles, if you search, on companies moving migrating away from the cloud.