The more I hear about the Epic vs Apple lawsuit, the more I think it is a good thing that Epic sued Apple...
What exactly does Revenue Share / Gameplay share mean? Bit confused here but I'm daft with these things.
The numerator is revenue from PSN divided by all revenue.
The denominator is gameplay hours on PS4 divided by all gameplay hours.
In other words, the developer/publisher would need to pay Sony a royalty if PS4 players' spending on a game is unusually low compared to other platforms or PS4 players' play time is unusually high compare to other forms.
For example:
Let's say the developer gets $90 from PSN and $100 everywhere. The players play 180 hours on PS4 and 200 hours everywhere. The ratio is (90/100)/(180/200)=0.9/0.9=1, so no royalty.
Now let's say the developer gets $50 from PSN and $100 everywhere. The players play 180 hours on PS4 and 200 hours everywhere. The ratio is (50/100)/(180/200)=0.5/0.9=0.56, so the developer must pay a royalty.
Now let's say the developer gets $10 from PSN and $100 everywhere. The players play 20 hours on PS4 and 200 hours everywhere. The ratio is (10/100)/(20/200)=0.1/0.1=1, so no royalty. This is because despite the PS4 platform being only 10% of the revenue, it is also only 10% of the play time.