Given these facts, you Bitcoin fans need to prove that the fundamental value is different from zero (or close to zero) - otherwise it is a by definition a bubble
No. Fundamental value of one bitcoin is equal to the cost of production of one BTC,
approximately 800$ if i'm not saying bullshit.More precisely, price depends of kWh price,
At $0.12 kWh a Bitcoin costs $1,567.88 to mine.
At $0.04 kWh a Bitcoin costs $522.62 to mine.