ELI5: what/who is the bonded courier?

Been out of the crypto sphere for a while, and I've returned to hear this new term a lot. What's it all about, and what is its impact?

submitted by /u/ChooseBeef
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source https://www.reddit.com/r/btc/comments/eouv7q/eli5_whatwho_is_the_bonded_courier/