Verizon Google Pixel 2 bootloaders can be easily unlocked: No exploit needed

A newly bought Pixel device from a random seller can switch between carriers but the bootloader shows as locked. Are all pixel devices' bootloaders locked by default? And how to show that it is possible to unlock the bootloader? And how to re-lock it for Pixel 2 XL. Any sources would be appreciated.

Verizon Google Pixel 2 bootloaders can be easily unlocked

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