Bubble 1.0 created an asset class that the public could get irrationally excited about and invest into. Calling this Bubble 2.0 is misleading. The tech bubble in the late 90s could characterized by companies going public with sky-high valuations without revenue. It seems obvious the major difference is that there are still very few companies going public. And the companies that do all have meaningful revenue/profit.
What I think we are seeing now is the Venture Capital bubble. Lots of funds have shitloads of money they MUST put to work. If they don't put money to work most firms can't raise another fund and at some point the LPs can back out of their commitment. For a while now there is a market where the only way to put large amounts of money to work is to make much larger investments at a high valuation, expecting a lower return.
9 and 10 figure valuations are being driven by too many large funds chasing too few good companies. The LPs will get burned, funds will close, but there is going to be no collapse of the venture/seed market.
If you see this Bubble "burst" it will slowly over the next 5-10 years when second tier funds can't raise more money. VC is turning to a winner-take-all game where only the top 3-5 players make sizeable returns, because their brands are the only ones who afford them access to deals.