Cancel culture does exist, but it is way less influential than people think it is. There are a few cases of random people losing their jobs by being outed as white supremacists or for harrassing people in public or whatever, but for the most part twitter mobs have very little influence outside of specific twitter communities. Most of the really aggressive cancel guys are either kpop weirdos (I'm not kidding) who will mostly harrass people who take the mick out of their stupid cloned bishonen idols, or they are tumblr-exiled teenagers who mostly go after leftist youtubers. For the most part, if someone is already a celebrity, typically the most they'll be "forced" to do is issue an apology and then most people just forget it within a week.
I don't scour twitter for examples of course so there are probably tonnes of situations I don't know about, but I still feel like "cancel culture" is a buzzword that doesn't really have much impact on reality.