I think the license change is a pretty bad reason to feel smug - unless you are building a competitor to or platform on top of Terraform. Spacelift is stuck in a weird place because of this, but most users won't be.
Using GitHub Actions to deploy your Terraform code (you becoming the third party) is competitive with HashiCorp's products. There is no delineation about commercialization.
HashiCorp probably won't come after you, but to me it shows this wasn't really thought through or it's maliciously ambiguous.