Naming Spacelift, Env0, Scalr etc as suppprters without mentioning they had no other choice than to move away from Terraform feels like its missing some context.
I would assume they could've licensed it from HashiCorp but for a huge sum.
Maybe. Maybe not. Maybe hashicorp would have agreed to sell a license to them with terms that allowed their usage of terraform in their products. But it is also quite likely that they would have refused to grant such a license to their competitors.