The original Droid was deliberately released with firmware that didn't require a signed file to update, as was the Cliq. Motorola first locked down the Milestone (the GSM version of the original Droid, sold outside the US). They mentioned (in passing, in very small type) that they would continue to lock down most/all future phones with Android.
They didn't "happen to fail". They chose not to lock down the Droid, probably at the request of Verizon.
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The original Droid was deliberately released with firmware that didn't require a signed file to update, as was the Cliq. Motorola first locked down the Milestone (the GSM version of the original Droid, sold outside the US). They mentioned (in passing, in very small type) that they would continue to lock down most/all future phones with Android. They didn't "happen to fail". They chose not to lock down the Droid, probably at the request of Verizon.