Why SHOULD they? That would hurt the carriers and limit differentiation. If a carrier wants to spend the money and time to develop and incorporate something exclusive to them, why should that be available to everybody else? Just because I buy a HP computer with Kapersky anti-virus on it doesn't mean somebody who buys a Dell should get it for free too.
Because Google has pledged openness in the name of Android. It's an open market, it's an open platform. Google pledged these things to combat Apple's very closed and gated App Store.
Having carrier-exclusive apps like Skype is directly opposed to having an open platform.
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