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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.
Because this was primarily about mobile. And because they can sanity check by looking at home many "installs" are reported by Apple and Google. I'm convinced that's half the reason why they did the weird move of basing this on installs and not purchases (the other half or so being that they needed some way they can get more money from the bajillion free-to-play mobile games out there that Unity dominates)
And they can sanity check SOME numbers being reported by Steam/Sony/etc though console and PC matter less to them.
Also - how are they currently getting metrics for game revenue that they'd bill off of? Seems like a lot of self-reporting would be happening there too? And enforced with contracts, etc.