A proposal has been published on the Make WordPress blog that asks for feedback on the idea of licensing Gutenberg under the GNU General Public License, v2 (GPL v2) and the Mozilla Public License v2.0 (MPL v2.0).
Matt Mullenweg notes that allowing people to embed Gutenberg under the MPL might increase its usage outside of WordPress:
“Right now it’s easy to distribute Gutenberg with web apps that aren’t GPL, due to the way browsers link and bundle things, but embedding Gutenberg inside a native app on desktop, iOS, Android, or beyond is not possible unless the entire application is also GPL.”