If Meta announced that every company hosting a React website needed to pay them a licensing fee starting next month or shut it down, they would (rightfully) get vitriol for it. That is what this is equivalent to, not big companies using open source projects. HashiCorp is free to use whatever open source they want, including in proprietary products (that's the entire point of open source). It's the rug pull and blindsiding of the community that is the problem.