I am not sure it is a culture “sneaking” anywhere as much as openly and aggressively taking over. This is very true at least in Facebook, Google, Amazon, and Netflix. The intolerant far-left employees openly discuss personal politics on employee mailing lists and forums, unprofessionally spending paid company time on activism, strategizing on how they can control the company and use it to further their political agendas. They achieve their political ends by pressuring executives, pressuring HR, altering the company’s products, pushing policies (both internal and external) that support their views, etc. It is very hard to escape - you see it in mandatory “equity training”, in work conferences that invite far left speakers, and even in trivial things like where to get food for a team lunch (a vocal employee might demand that no money be spent on businesses whose owners don’t pass their purity test). Given how vocal and ruthless activist employees can be (due to the psychological safety of echo chambers), there is no room for any other view whatsoever. It is exhausting, unprofessional, and a big reason why claims of bias from big tech companies are real, not imagined.