@Maximara and yourself are forgetting that those who qualify for this in the first year (or subsequent years) will only be paying 15% commission in 2021, so the math is different for them... post-commission earnings of $1m (or "proceeds" as apple call them in the press release) would come from $1,176,470. It's an extra $176k in the dev's pocket.
The $1,428,571 figure is still relevant in terms of deciding eligibility for the next year
for devs who are not currently eligible, since their proceeds would be just under $1m.
That then raises the conundrum of the dev who sits at $1.3m sales every year and flip flops in and out of the program...