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Here is a helpful paper on the topic.

By default, manufacturers (OEMs) like Samsung, Google, and Motorola lock the bootloader to ensure that only "official" software can run. This prevents malware from embedding itself deep in the system. However, for power users, this lock is a digital fence. Unlocking it is the first step toward installing custom operating systems (like LineageOS ), gaining "root" access, or removing "bloatware" pre-installed by carriers. The Conflict of Ownership vs. Security http bitly oemunlock