That's a useful workaround when Apple allows it, which they haven't done consistently.

But that's not at all what I meant by opting out. I meant "If this is the price for 'exposure', just stop giving me 'exposure' and let me sell digital goods in my app."

Also it's not just 'digital goods', it applies to services too. You can currently manage a netflix subscription in the app, I think, but it's been unavailable a lot and netflix seems to have a special exception that doesn't apply to video services in general.