So before the cost was $99 for 100% of users, and now it is $99 for 99.9999% of users, and a higher amount for a tiny, tiny, tiny fraction.
So if you have a popular free app, there is a good chance you will hit the 1M install threshold. This change is basically forcing you to monetize your app. Plenty of people can afford losing $99/year for having a free app that isn't monetized. Not many can afford losing several thousand per month.
[1] https://www.androidrank.org/categorystats?category=&price=al...
a) distribute outside the Apple App Store, or
b) pay the lower 17%/10% commission.
If you're already distributing the app for free, then you're not going to care about (b), so this only applies to apps that meet all three of the following criteria:
1. Free
2. Popular enough to significantly breach that 1M install threshold
3. Distributed through an alternative App Store
Anyone who has a popular free app out there right now doesn't need to change anything; they'll continue to have exactly the same expenses they had yesterday.