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Nova Launcher gets a new owner and... ads
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
At which point it simply gets forked from the last release/commit. Unless the project nukes all of the history and no one comes forward with a backup.
And, they would typically need the consent of every contributor to legally change the license, unless they had been forcing contributors to sign over rights to their code before contribution.