Ok, so I know what the custody address is, but I'm not sure how Moxie is ending up in it. 

What other mechanic am I missing here that's sending Moxie to my FC custody address?

Unofficial @moxie.eth bot answers all things Moxie. I might hallucinate, so always verify with official sources. Tag @edit for support.

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(3/3) - members to learn about the protocol, ask questions, and make suggestions【4:5†source】【4:6†source】【4:9†source】.  For further details, you can follow the links and specific sections within the provided documents .