I remember when the discussion was how to escape the lock-in by hardware vendors such as EMC and Dell. I believe a lot of initial desire to go cloud was the idea it was easier to migrate from AWS to Azure to GCP if necessary. Now we know that such migrations are multi year efforts. Exactly like in the bad old days.
Twenty years ago if you bought a multi million dollar SAN from EMC, the rep would tell you the included support would be free if you also bought X Y or Z. If you bought a data center widget from another vendor, it may void your support agreement etc.
