Multi-cloud is often recommended by consultants and vendors alike. The reality of operating it at scale is considerably more complicated.
The Hidden Costs of Multi-Cloud
Operating multi-cloud requires maintaining expertise in multiple environments, maintaining abstraction layers that add complexity, giving up cloud-native services that could provide significant developer productivity benefits, and paying data egress costs when services on different clouds communicate.
The Smart Single-Cloud Strategy
For most organizations, a well-architected single-cloud strategy is more defensible than multi-cloud. Design for portability using standard interfaces where they don't sacrifice significant capability, while maintaining a credible path to migration if circumstances require it.