Honestly, both positions are arguable. But, and it's a big but, the fact that it is their hardware and their OS points to the former (their platform, their marketing).

Ultimately, it's their storefront, so who they do business with - and the terms of that business - is their choice (as is so often argued when free speech and platforms comes up here on HN). Competition exists, in the form of other hardware and other OSes (though, Epic's Fortnight was kicked off Google's store for the same reason as it was kicked off Apple's).