That's being disingenuous. The link you cite is the pricing of Pulumi Cloud. Of course hosting infra can cost money. The second non-heading line in your link shows a way to host Pulumi on your own infra and that is fully free: https://www.pulumi.com/docs/concepts/state#using-a-self-mana...
However, Pulumi Cloud is only as valuable as Pulumi itself. If Pulumi didn't support deploying to AWS, for example, then it is useless to my organization which uses AWS and I'm obviously not going to consider Pulumi Cloud. So Pulumi does gain a lot of value even from just the Terraform AWS provider that it uses under the hood (and which it can continue to use because it seems Terraform provider licenses are not changing, which is nice).
However, Pulumi Cloud is only as valuable as Pulumi itself. If Pulumi didn't support deploying to AWS, for example, then it is useless to my organization which uses AWS and I'm obviously not going to consider Pulumi Cloud. So Pulumi does gain a lot of value even from just the Terraform AWS provider that it uses under the hood (and which it can continue to use because it seems Terraform provider licenses are not changing, which is nice).