In general, whatever else one can say about Apple, it’s hard to see them having a monopoly in anything. Apple phones are about 1/3 of all phones in use; Apple laptops are well less than 20% of all laptops (bigger than I would have guessed), their VR headsets in use might crack three digits (OK, an exaggeration, but could there be more than 100K actually in image? I doubt it), etc.

Same is true in software and services (does anyone use iMessage outside the US?), and every place that takes Apple Pay takes Google too, nd most also take Samsung; many countries just use QR codes.

And especially if you look at small organizations without much funding that use old PCs (or just have crappy IT departments)... it's disappointing. This kind of restriction won't stop a billion dollar LiveNation, but it absolutely could affect the local library or cafe.

In response to your edit (ignoring that you used a piece of hardware for that example): Apple makes a lot more software than ASUS. Everyone knows the software is part of an Apple product; that's been a thing the whole time macOS has only been (officially/easily) runnable on Apple products.

1. https://www.asus.com/accessories/bike-booster/asus-oxiis/