Acknowledged and true that there is always someone with a contrarian pessimistic view. Chamath seems bent on "burning it down" after his own firm went through what objectively looks like a meltdown.

Also true that later stage companies have working business models (though they are typically not profitable a tradeoff they willingly make for growth). See the comment above on plenty of funding post SoftBank round. I've also observed that their valuation forces founders to do subsequent down rounds.

The Ponzi scheme argument (not perfect) is the gains are all paper valuations that are based on growth continuing or more investment being piled in. Once that stops the whole thing crumbles. After Softbank with a $100B fund, where else does the funding come from? IPO?