So, the only value that Apple provides to developers is payment processing? That's a ridiculous statement.
No. But developers provide value to Apple equal to that provided by Apple to developers.
These is one of those arguments that falls apart when you consider it in any other context. A store needs products just as much as products need a store. Does that mean the store doesn't provide any value other than payment processing?
A platform isn't a store. Apple built a platform because they know that enabling 3rd party apps on their platform (iOS) makes iOS more valuable. Apple didn't create the App Store because they wanted that 30% revenue. They created it because having 3rd party apps on the platform made the platform more useful, users would spend more time with their platform and thus see iPhones as more worth buying.
Again, this comes to a point I keep trying to make, if Apple deserves compensation for creating the platform it should be getting compensation for all developers, but it doesn't it carves out all sort of exceptions. Mostly for business reasons, and as your own data points out, only 13% of developers pay a commission. If Apple is truly entitled to a share of revenue for creating the platform shouldn't this number be 100% (of paid apps)?
So do I. I just believe that the DMA and the EU's overall strategy so far is a poor way to accomplish their goals.
Alternatively, Apple has invested billions in creating a platform for Apple Fitness, that a competitor gets to take advantage of for a mere 15-30% of their revenue. Seems like a good deal to me.
Investing to give yourself an advantage in a market isn't anticompetitive. It is competing.
Let's consider the telecoms, telecommunication companies also invest billions in the cellular infrastructure, and there was a time they too thought they were entitled to a share of all revenue that occurred on phones on their network. Apple used their power to break up this rent seeking behaviour and governments are treating telecoms like utilities, yes they provide a service and are permitted to charge for that service, but they are not entitled to all revenue that flows through that service. This is how I believe Apple should be regulated. The app market is too important to leave it up to the whims of private companies.
If Apple is entitled to revenue on top of the revenue they get from selling a product to consumers then the telecom companies are also entitled to a share of revenue that occurs thanks to their network (which they also invested hundreds of billions into).
I understand that you want Apple to be forced to meet your preferences. Blaming them or accusing them of wrongdoing because they don't is silly.
I believe my preferences are good for citizens and consumers, I believe they have themselves to blame for this regulation because they behaved in ways that negatively affect consumers.