One of the mechanisms that let #Hashicorp relicense their stack was the CLA. Whenever you see an "open core" shop (ie, they have proprietary "Enterprise" versions or extensions) and they require you to agree to a CLA before accepting a PR, be aware that the company may not be using #opensource in good faith and may relicense your contributions to be proprietary. Think twice about spending your time and efforts if such a move would bother you.
