Earlier quoted context omitted.
This seems like a pretty large misreading of the situation. Yes, the most disagreeable thing about Apple's IAP policies is where they forbid links to alternative purchase pages. But it is also the smallest of the current complaints. It's not "additional" means of purchases many companies are pushing for. They want to be able to avoid offering Apple's IAP whatsoever. I mean, ProtonMail did not have IAP in their app at…
Yea, I have trouble understanding how this is any different than how people purchase things in person. When you go to Best Buy and buy a TV they obviously aren't going to let the TV manufacturers advertise that you can buy the TV for cheaper directly from the manufacturer. Obviously it's not a 1-1 comparison, but Apple is giving the apps a similar platform to sell their product.
The problem and complain is much more complex once all these additional factors comes into play. It isn't so much a problem if we look at it in isolation. As in your Best Buy example, which I agree is perfectly valid.