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Unity introduces new fees for game devs based on revenue and game installs
(www.gamingonlinux.com)
That does sound like someone at Unity had a fatal brain hemorrhage.
Haven't read the article yet, but I wonder if this counts for existing games (read: existing games which update to the new Unity version) too?
It does.
Note: Unity said it won't be applied retroactively when you hit the cap, the install fee is charged after the threshholds have been met for additional installs. However, it will apply to games already on the market. However, games that do not hit the thresholds or aren't monetised at all will not be required to pay the fees.