I don’t really see it like that, unless it’s something mainly done on right-wing circles.
If people don’t want to stay on Twitter or Facebook because of all the stuff their owners are doing, that’s not Cancel Culture, that’s just having a brain. To me, a response to serious offenses is definitely not cancel culture, you can’t “cancel” billionaires.
If not “cancel culture” though, what would you call what happens to those “less serious” offenders? Just “large-scale harassment”?