For one they seem to be getting a lot of regulatory pressure, so this may ease that a little bit. For two, you can only push back on web standard support for so long without it negatively effecting their standing in the web community.
Also remember Apple was at the forefront of the mobile web industry. Because they launched the iPhone without an app store and proudly said the web was app store (paraphrasing). That and killing Flash were some of the best mobile web milestones.
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