Because Bankman-Fried is a mouthful/typeful to say every time, and Changpeng is a big, non-western name, and Zhao too common by itself. Source: me referring to

Because Bankman-Fried is a mouthful/typeful to say every time, and Changpeng is a big, non-western name, and Zhao too common by itself. Source: me referring to one of them in conversation a lot with no incentive to kowtow to his preferred branding.