IMO, OpenStack was sort of a consortium effort to compete with VMWare, AWS and Salesforce, but it's operational model is closest to AWS. Nearly all the big enterprise IT companies tied their rafts together hoping to stave the flow of customers. It doesn't appear to have worked.
RackSpace is advertising AWS migration and consulting services on podcasts I listen to. Not exactly a stellar testament for their own cloud product, but I think they still participate.
HP's strategy is a bit haphazard given the recent corporate splitup. On the plus side, the HP/HPE split seems to have allowed HPE to ditch all the weird www# URLs. They retired their public cloud, but still sell hardware that can run OpenStack at least.
Dell bought EMC, and proceeded to shut down their OpenStack offerings in favor of VMWare, which they own a substantial fraction of.
IBM is in a continual process of downsizing its hardware divisions in pursuit of higher earnings per share. It seems their big push is cloudfoundry, which seems to be more about containers and k8s.
So why are they bailing? I'm guessing:
- it's way harder to hire support staff for OpenStack, than VMWare - AWS reduces capital costs and upfront investments - Customers on existing solutions aren't prepared to take advantage of new opportunities - Many of these companies have existing product lines they don't wish to disrupt