[fy20]

It's worth mentioning none of these concerns affected Android / Google Play, even though it's fairly easy to sideload and even install custom app stores there.

The only phones that come with alternative stores are from Chinese manufacturers, which isn't going to be an issue for Apple as the operating system isn't open source.

[Operyl]

Didn’t Samsung introduce their own App Store?

https://galaxystore.samsung.com/

[hatsix]

it ships both app stores on every android phone. In my experience, people only use the Samsung store by accident

[Operyl]

I was just refuting the “only Chinese phones have alt stores” factoid.

[wkat4242]

The OPs main point was that the existence of sideloading or third-party app stores hasn't led to major security issues. And apps still have to comply with the sandboxing.