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Iirc they're switching to that model (google uses it's own key) but they need the developers' keys for older apps because android won't allow changing the key w

• pavon 5y ago
  Except Google maintains the code that performs those checks. Rolling out changes to key checking will result in a longer transition, but it is more legitimate than demanding developers hand over private signing keys. And in the meanwhile Google Play store knows which phones have been updated, so it can provided the slimmed-down Google-signed APKs to them, and the universal developer-signed APKs to everyone else.