They can and did use it in commercial software before relicensing. I don't have a problem with that. It's a betrayal to get a huge community together under one expectation and then decide you don't like that expectation any more. Had they used, even something like AGPL from the start it would not have been successful in the same way, would not have gotten the same levels of outside contributions, so yes it's a betrayal.

It's a limited betrayal, because that license also allows for OpenTofu to exist and fork, but the need to do that is just annoying.