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That is very laudable, but I'm not sure if prostitutes are ever going to qualify for a business expense

There is nothing suggesting they were, and as far as I can tell, nothing to justify this information's inclusion in the article.

They might if buying them for one's potential clients instead of for oneself?

From what my buddies in finance tell me, these things are expensed as dinners.

Yep, meals and "entertainment".

A rather regular thing in some circles. Cryptos certainly being one of those circles.