To add a concrete example to this, I worked at a bank during a migration from a VMware operated private cloud (own data center) to OpenStack. In several years, the OpenStack cloud got designed, operationalised, tested and ready for production. In the following years some workloads moved to OpenStack. Most didn’t. 6 years after the beginning of the whole hullabaloo the bank cancelled the migration program and decided they’ll keep the VMware infrastructure intact and upgrade it. If you’re in North America, you know this bank. Broadcom can probably extract 1000% price increase and still run that DC in a decade.