Hacker culture is still around, not so sure about startups though.
We still have TCP. We still have Linux. We still have gcc, Debian, Fedora, Gentoo and more. Now, that last mile connection is still looking dicey; if a lockdown is applied, it will be applied there.
This is a bit flippant, but maybe hacker/startup culture just moved from being applied to tech to being applied to politics? It seems like the technofeudalism promoted by some could apply a similar ethos.
Hacker culture and startup culture are two entirely different things, with entirely different worldviews. The overlap in the Venn diagram isn't as large as many think.
Sometimes I wonder what is actually left of hacker/startup culture?