It's a friendly metaphor, not real coffee. Each "coffee" is $5 and you can buy as many you like.
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About Shawn He
Tech/AI/health/finance. ex-NASA SBIR engineer, full time nerd.
Got a question? Buy me a coffee first! I am grateful that I am bombarded with questions every day but I can't answer them all. I will give you my opinion but might not be able to solve specific technical problems unique to your situation so donate at your own risk!