> the determination is made based on the degree of likelihood that [it will prevent alternative browser engines] If you interpret that very liberally, doing a region-locked "you can release alternate browser engines but only regionlocked to japanese apple accounts" could be seen as intentionally preventing alternative browsers from existing. Why would mozilla port firefox when it can only target a tiny fraction of it…
Mozilla is used to only a tiny fraction of users anyway. Why would this be any different? It could also be a chance to release a version for QA by the users before the rest of the market opens up.