If you make something people want you can sell it. When I started our company 4 years ago I'd have considered $1m ARR a massive achievement. Now I'm here in my heart I feel a need to grow and raise or we'll die - but In my head I don't think this is actually true.
I don't think there has been a time in human history before where a company of our size (30x median wages) could have been built without needing a great deal of capital.
If Microsoft/Google et al want to use Blackrock/Vanguard's money to buy up small companies that creates more incentive for the young and idealistic to start such companies. While economic security is of sufficient value that resisting a first buyout would be hard for most (hence Sergey and Larry trying to sell for $1m) once a first buyout has been achieved a second buyout can never be forced.