I'm not saying I agree with Apple's approach, but it does affect you. Just by having alternative sources, developers might choose to only be available on those

I'm not saying I agree with Apple's approach, but it does affect you. Just by having alternative sources, developers might choose to only be available on those sources, whether it's for a better revenue cut or because of their principles. See for example what's going on with exclusives for Epic store and Steam. Whether that's a good or bad thing is a different question.