It feels unfair to describe it as a "rugpull" when the first bullet point, in bold, reads:
> *Grant of copyright license*. You give HashiCorp permission to use your copyrighted work in commercial products.
Unless that text was recently changed, or unless Hashicorp went out of its way to verbally reassure people that they didn't intend to ever exercise that option, I feel very little sympathy for any open source contributor who clicked that link and then was dismayed to find Hashicorp using his work in a commercial product.
Read what you sign, and take responsibility.