Cultures can absolutely change and evolve, in response to changes in leadership, new sources of revenue, or growth. Apple 1984 vs 1994 vs 2004 vs 2014 is a good example, particularly in the late 80s and 90s when it changed quite radically. Yet Steve Jobs' design-focused culture and marketing prowess (along with some negative aspects) re-emerged when he came back, and even as the company's growth exploded.

Google's cultural shift is not just a byproduct of growth, it's a byproduct of the founders and early leadership stepping back and professional technology executives and MBAs taking over. Compare that to Apple, which followed a similar journey but boomeranged back under Steve Jobs Act II. Cook, himself an MBA, is more in the Jobs mold when it comes to corporate ethics; I think his stance on privacy and other issues is admirable. And it's one of the largest tech companies in the world.