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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.
This isn't really useful for data heavy games such as the one I'm working on.
It doesn't help that Unity-specifc stuff seeps everywhere (stuff like floating point Maths, Vector classes, Time and so on) mainly because Unity themselves push people to go that way rather than use the .Net equivalents (which aren't quite equivalent).