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Unity backtracks, no runtime fee for sub $1mil or for games on current/old versions
(blog.unity.com)
This is a most excellent place for technology news and articles.
Ongoing projects will probably not migrate engines as it's prohibitively expensive & time consuming, but only a really clueless dev would start a new project in Unity. I guess it's kinda the perfect scheme for a cynical short-term "investor" who's just trying to pump company revenue then dump their stock, as the results of this may not be fully realized for a few years.