I think you should aggregate by app installs, not distinct apps. The apps to make most impact, are most-installed apps. What if my app blows up to a tune of 1.2 mil? I'll be paying 400k Apple tax just because that's why?
Because the 30% is "opt-in" not automatic, the $1m threshold applies to all your apps and associated accounts apps combined, and $1m is just not a big target anymore considering 8400 people on $10/month subscriptions will get you over that line.
And of course, when they announced this big discount it was reported to apply to about 5% of actual IAP spending, which would make the average commission fee being paid around 29%.
That's a 2020 report,by 2023 Apple was saying the $1m+ developers had grown to 10% of developers and many small developers were now earning $1m+. Correlating of course with the subscription-ification of everything.
Only apps with more than $1,000,000 annual revenue are paying 30%. Most apps are smaller than that and are hit with a 15% fee.