Apple subscriptions provide me an extremely valuable service. They are easy to track, cancel & pay for. To the point I will not use an a subscription on my phone that doesn’t go through their mechanism.

Is that valuable enough to charge 30%? I don’t know but it’s certainly not outside what seems reasonable by orders of magnitude to me.

I’m sympathetic to the argument that they are a monopoly and should be forced to allow alternate app stores or payment processors but it’s not what they are charging that puts me over the line.