I do wonder how many people are staying on Twitter due to follower count alone. Having had an account for over a decade, I'd have previously estimated about 20% of my followers were dead accounts. Based on now leaving and making new accounts on other platforms, my estimate is closer to 90%. 

As a blogger I've always known only like 1% of people who retweet/like a post actually clicked the link and read the article, but I assumed that was just a social media thing. Having experimented with basically every other platform, I learned it's more likely that a significant number of Twitter engagements are fake, and those that aren't don't really care enough to read your work, they'll just give you a retweet/like for appearances.