The trick is not to get attached to a project name. `Terraform` is a trademark of IBM (previously Hashicorp). Terraform used to refer to an open-source IaC project, but now it doesn't. OpenTofu, https://opentofu.org, is probably the most accurate name for the continuation of that open-source project.

This is of course the correct way to proceed as an affected user but does not mean the bait and switch cannot be criticized.