And in the end that affects the end users because more things become useless adfilled crap because it's more profitable, and everything is more expensive.
I don't even get how you're comparing grocery stores (which do NOT have a 30% profit, maybe 4-6) to Apple passively making 30% off anyone who wants access to "modern day people". Grocery stores don't scale like virtual markets, when you buy something you cost the store money, when i buy whatever through App Store it costs Apple virtually nothing and they make 30% because they like it.
Obviously regulators seem to agree with me and at the end of the day they make the rules, and I agree with the regulators in this case and I don't think many people think what Apple is doing is good and appreciate it. People are forced into the iOS ecosystem because that's what everyone uses in some profitable parts of the world too.