Harmonized Histories?

We reverse engineer three popular live streaming platforms (YY, Sina Show, and 9158) and find keyword lists used to censor chat messages.
Tracking changes to the keyword lists over the past year gives an inside look into how these applications implement censorship
Censorship is reactive often in response to current events.
The keyword lists between companies are not identical suggesting that there is no centralized list provided to them by authorities.
Censored keywords include references to collective action and government criticism serving as a counterpoint to recent studies.
Censored keywords include names of competitors, which appears to be motivated by business interests rather than government pressures.