I recently heard from someone at stripe that their whole internal comms is dead. People are extremely unhappy and disengaged. Something surely is going on.
What is meant by internal comms in this instance? Stripe had probably the most vibrant Slack environment of any place I've ever worked. It'd be very strange indeed if somehow people stopped communicating that way.
If they had, but not anymore then this highlights the trend in the OP. But usually these things would also happen when successful start ups become more corporate like and original leadership changes. At certain point it's really difficult to hold the culture that initially existed.