By the 2010's there is a totally different culture. Call it 'All Birds' culture.
1990's there were a lot of weird folks, hippies etc.
2010's 'All Birds' is more commercial, fashionable, a totally different kind of culture.
1990's tech was about tech, it's upstack now, so more like tech applied to classical business problems.
AirBnB isn't really a tech company, it happens to be because other, more established companies were not able to integrate tech quickly enough to develop those kinds of markets, where you want to have strong tech / IT instead of relegating them to the back office.
Even Facebook, it's a social media company really. Which is different than Oracle, Sun, Microsoft.