This is precisely why we can't allow platform-owners to be the arbiters of what software is allowed to run on our devices. Any software signing that is deemed to be crucial for ensuring grandma-safety needs to be delegated to independent third parties without perverse incentives.

This is what the Digital Markets Act is supposed to protect developers against. Have there been any news regarding EU's investigation into Apple? Last I remember they were still reviewing their signing & fee-collection scheme.