Earlier quoted context omitted.
"no underlying intrinsic value" How does that differ to investing in fine art, scarce wine, old/rare stamps and coins, limited edition/novelty items, historical artefacts, or even gold? There's loads of things that have kept value for centuries despite having no intrinsic value.
Yeah but no one uses these things as a form of payment/currency. Those are non-monetary assets.
BTC's value now could come from it acting as a store of value for example. Or its value could come from the novelty aspect. Or that it facilitates online gambling (leveraged bets on crypto exchanges) in countries where such activity is heavily restricted. BTC's value in the future could come from it being a historical artefact. Lots of subjective reasons investors may have for holding it (just like they hold a piece of art) beyond its use as a currency.