It seems hard to leverage wealth made in the early days of the IT boom for power if you didn't gain that wealth back then in the first place.
Edit: Added years these companies were founded.
[1] https://en.wikipedia.org/wiki/PayPal_Mafia
Now I think most people agree it's behind it's ceiling point. (most != all)
Of course before the first internet bubble also companies succeeded, but then when the bubble burst there was a dry phase.