Matt Chowning opened some issues in the Gutenberg repo to help begin the process of obtaining consent from contributors to relicense their work under the GPLv2 and MPLv2 licenses. Two days later Matt apologized in the wake of contributor reaction to the number of notifications that went out and the publication of committers’ email addresses:
“In aiming for transparency and simplicity there were unintended side effects of adding noise into your daily lives with the GitHub notifications. I apologize for this negative impact to you and any other unintended consequences.”
Notably, this license change will allow Gutenberg to be used across different services and content management systems. Dual-licensing was first brought up in a Gutenberg discussion on GitHub on July 2, 2020.