In my opinion a huge role in the raise of IT people salary is their tendency to brag about their salary, one way or another.

For better or for worse, this lead to discussions about salary, negotiating practices, and to people looking elsewhere.

I sometimes speak with people that work in other fields and many of them have zero clue about these topics, whereas in most IT-related discussion boards (whether it's HN, reddit or whatever) there's a related thread in an almost periodic cadence. We in IT are kinda obsessed with these topics (we're discussing this on a VC-owned discussion board after all).

On a different topic: is there any data for salaries in other fields for the same companies (FAANG and similar) ? It'd be interesting to see how much earns, for example, a lawyer in such companies.