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At the very end of last week, Unity finally revealed its revised plans for the controversial Runtime Fee, which originally intended to charge developers every time their games are installed past certain thresholds.
You can find the full details here, but the key points are that the fee no longer applies to Unity Personal users, while Unity Pro and Enterprise developers have the option to avoid the charge in exchange for a 2.5% revenue share based on self-reported revenues.
source https://www.gamesindustry.biz/has-unity-repaired-the-damage-done-by-its-runtime-fee-plans