I'm pretty sure that was done on purpose. "Fiend" is an actual word, which means evil, or a villain. "Fiendish" is a variation of the word. It doesn't need to be completed. It is a word on its own, and probably meant as a playful commentary as to his affection and knowledge of cryptocurrency.
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Thanx for let me know about the fiend word, I did not know about it at all.
Always happy to expand the vocabularies of the people of the world. ;)