a) Apple will still require the developer to be registered with their Developer Program in order to get the certificate to allow apps to be installed. They can simply ask for the cost of the app to be self-reported.

b) With existing telemetry they know which apps are being installed and run and can simply bill the developer directly.

c) In the case of a developer using a third party store, Apple can have an API which stores can use to report this information so they can manage the developer relationship themselves.

d) All of the above will simply shift revenue collection to a compliance activity. If you don't provide accurate details your certificate is revoked and you're banned from the store.

> in order to get the certificate to allow apps to be installed

Personally, I think this goes hand in hand with the App store requirement - if that one will be lifted, the certificate one will be lifted as well.

> They can simply ask for the cost of the app to be self-reported.

The app itself is free, and the customer will pay for something else instead. I'm not sure about the legalese (possibly different per country), but this just reeks of loopholes.