Ask HN: Why Terraform Is Free?

I recently thought about this and terraform is used pretty much everywhere but it is completely free while lot's of effort is being put to maintain providers such as AWS/GCP/Azure. Doesn't it create mis-alignment - for example their cloud product is quite expensive because it needs to subsidize the free providers which are used by everyone and not paid by anyone which makes a vicious cycle of less people using the cloud version and so on. Wouldn't it make sense if terraform would cost money?