we left reddit because censoreship hurr durr
The people leaving Reddit because of censorship did so long ago. These dissatisfied/censored people have a new home anyway... They can view child porn, people being brutally tortured/murdered, and make all the threats of violence they want on Twitter now. They just have to be careful not to insult the, "free speech absolutist" dictator or he'll have them banned.
The mass migration today is because of dissatisfaction with Reddit's decision to end 3rd party apps and specifically, the way in which they handled it. The dishonesty, the heavy-handed dictator-like seizure of protesting communities, the complete disregard for accessibility/moderation tools, etc.
To claim that people are leaving Reddit "because of censorship" isn't just missing the point, it's flat out wrong.