Safari. I assumed this was overblown until I had the rich experience of developing a Flutter app that needed to work on every platform. Somehow, even Androids chaos is notably better to work with.
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Apple has like 6 apps in the Play Store and one of them is for helping Android users migrate to iOS. On the other hand, Google has dozens of apps in the App Store.
And Flutter Web not working on iOS doesn't even help Google. If anything it just hurts Flutter's adoption on the web which is already low. So I don't think there is some grand conspiracy within Google to take out Safari by withholding Flutter support.
(source: iOS dev turned Googler turned ex-Googler, so I soak in everyone's grudge matches :) )