Essentially, Twitter just sorta makes Mike feel bad. I know a few people who have decided that it wasn't improving their lives, and escaped; Laura Frohmwerk and Kris Straub are both exploring Blue Skies and Tickity Toks and seem to be having more fun than they were previously. Or, at any rate, their actions aren't feeding Twitter's in-house AI bot or providing value and interest to someone they despise. There were many discrete thresholds where Morak might have decided that this was "his stop," and leave, but ultimately I think it was the return of Alex Jones that he couldn't abide.