As long as it's not released under a copyleft license, it remains a possibility.
That's not to say they've actually done anything untoward, but this is a warning to the people who have been bit by this dynamic one too many times
I have fucked up!!!!!! It is emby that is closed source fuckkkkkk!!!!!
"Emby has been relicensed and is now closed-source, while open source components will be moved to plugins. Due to this, a free open source fork of Emby was created called Jellyfin."