Kind of like how realtors make more money on a house transaction than the closing attorneys who draw up all the paperwork and execute it legally.
Apple is imposing a tax on revenue that is higher than the revenue that Patreon pulls in from each transaction fee.
There is no equivalent situation in a realtor market. In no world would a realtor sell your house for $500k and then tell you that they deserve a higher cut of the revenue than you do.