In all fairness, Apple didn’t start the 30% trend. It was already in place — Blackberry & Nokia both took 30%, as did most gaming industry, software and service outlets.
I’m not justifying 30%, but developer tools and support need to be considered, as well as the the userbase each company built as potential customers for developers. I once owned an online store for ecommerce plugins — there’s a long list of things beyond payments that many don’t realize.
There’s a lot of comparisons putting Apple/Microsoft in same sector, but they’re entirely different. Microsoft licenses Windows usage on other company’s computers. Apple makes its own products. We have to look at those companies differently because the business models aren’t the same.