“ #bitcoin can’t be a currency” nonsense.
• Most work for #fiat • You convert as much #fiat into #btc as you are comfortable with • Buy things with #bitcoin • Replace any spent #bitcoin by converting more #fiat retaining your proportions
Even if you spent 1 bitcoin for coffee ten years ago you dont live in the past, and you replaced it at that point in time.
Sounds like a #currency to me.