github.com/rezonant
Google's announcement is also confusingly written, but I believe your interpretation to be mostly correct as best I can tell.
There's a lot of added complexity because of the <1M plan which isn't new, which put the cut at 15% for under 1M of revenue. Also if you participate in whatever these confusing programs are transactions from brand new installs of your app will be only 20% but transactions from existing installs (before the change) will be 25%...
Ugh
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