There's a little bit of hyperbole, but aside from the obvious things like job loss at those respective companies, in a lot of these cases their valuations are wildly disproportionate to their actual value to society (and not just in a SJW way, but in a literal way). Take the nvidia case - yes they're baked into a lot of systems that would be problematic to replace. But if 90% of their value is coming from AI -- which didn't exist 5 years ago and isn't really necessary (let alone mission-critical) for anything right now -- it could just evaporate, we'd be left with a much smaller or disappeared nvidia, and few would be worse off for it. Tesla's another good one. Their valuation is ridiculously out of whack with their deliverables (cars and energy systems). It could go poof and dozens of other vendors trading at more reasonable valuations and with extremely similar portfolios of products could sweep in to fill whatever latent demand there might still be.