Can you clarify what "2x/3x salary increments" means? Are you saying people are tripling their salary? Or do you mean, like, 3x a normal (~3%) raise, or whatever?
That trajectory seems believable over several years, but I thought people were talking over the last several months. (Also, I'd say even that trajectory is somewhat unusual, without something significant changing like a getting a degree or location change from a third tier city to SV, or something.)