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EU antitrust chief to Tim Cook: Apple must allow third-party app stores
(appleinsider.com)
This is a most excellent place for technology news and articles.
This really is the key to this being successful I think. Right now a lot of the nervousness around opening iOS is because of the fact that people (rightly or wrongly) trust and have a relationship with Apple.
The people who are concerned about third party app stores really are worried about the implication of having to trust a new third party with their device, their payment details, their personal info, etc.
Put someone reputable behind an alternative and it becomes an easier sell.