> For all sales between $10 million and $50 million, the split goes to 25 percent. And for every sale after the initial $50 million, Steam will take just a 20 percent cut.
https://www.theverge.com/2018/11/30/18120577/valve-steam-gam...
Valve's strategy looks like to maximise revenue and get big companies on board that do $10+ mil in sales giving them incentives and discounts to be on the platform. (I think of it as tax break to incentivise high-earners to stay in the state/country)
Apple's strategy looks like to put more money into small companies/developers, while still charging the usual rate it had for 10 years to everyone else to access market of 1+ billion users. (tax break for small business to get up and running)