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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.
You're not counting the several millions of dollars required for executive salaries yearly. Those executives are important because how else are you going to drain the life out of the developers who are actually maintaining the thing with useless meetings, bureaucracy, "cultural transitions", and other forms of daily torment?