As a corporate finance and valuation geek, Ill warn you now: dont try and time mood and momentum. Thats what is driving much of the valuations being thrown around.
If this blows up big time and it is found that the Big Tech firms were operating on lies and false hope, there will be consequences - in the form of shareholders demanding cash returned and setting limits on the cash balance held by Google et al. Apple has stayed smart staying out of this nonsense and not doing M&A.
Investing in projects with negative NPV destroys the wealth of shareholders.