In most places I've been, Terraform was used more for documentation than mobility. Sure, you don't need to unlearn Cloudformation if you switch to GCP, but you

In most places I've been, Terraform was used more for documentation than mobility. Sure, you don't need to unlearn Cloudformation if you switch to GCP, but you have a ton of AWS-specific stuff in your TF config that's going to need to be ported to the appropriate counterparts in your next cloud. But having a documented change history in Git for (almost) everything was much more useful than theoretical mobility.