لماذا تعتبر عملة البيتكوين باهظة الثمن؟

Excuse me, I'm somewhat puzzled. I've noticed that the price of Bitcoin has been fluctuating wildly in recent years, and it seems to be very expensive compared to other currencies. Could you explain why Bitcoin is so expensive? Is it backed by any physical assets or government guarantees? Or is it just a bubble that's about to burst? I'm quite curious about this and would appreciate your insights.