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Apple Argued Safari Is Three Different Browsers to Avoid Regulation
(www.macrumors.com)
This is a most excellent place for technology news and articles.
You’re overthinking it.
Having 25% of the mobile browser market, and being more than half of the US mobile browser market means:
It’s a play for partnership cash and, because Apple has always been a control freak, insurance that experiences on their platforms are right.
Edit: One more massive thing, but I can’t believe I forgot. Apples hold over the browser market means they can strong arm the industry into adopting Web standards that Apple wants.