I noticed that there are a lot of new users participated in the Technocup 2016 Round 1 (only visible via Russian locale) and many of them ranked pretty low.
The average rating increase for returning participants is around 50. (Sum of rating change is around 13000)
If we assume there are 25000 active codeforces users, and we distribute those "extra rating" to every user, that means every user gained 0.5 rating just because of this contest.
This article states that one of the cause of inflation could be players received a too high initial rating.