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Unity will start charging developers each time their game is installed
(www.engadget.com)
This is a most excellent place for technology news and articles.
I agree with the essence of your post, but the part about Unity already charging devs proportionally based on sales is not true. The editor is currently licensed per-seats and there is currently no cap to how much money you can make if you run the enterprise license, which is 5k/year per employee.