Because I follow him and so do many others. When you like something it shows your followers the tweets. And he's a public face of ML on social media so many people will be concerned at his cheerleading.

While most in ML and tech are expressing dismay (e.g Chollet), it is just concerning that he seems to be revelling in what is happening to Twitter engineers (of whom I know a few)

Interesting to contrast the reactions of Chollet (ML library engineer at Google) vs Ha (former Goldman Sachs, 'strategy' guy). Chollet is vociferously speaking about the impacts that will come when you shut down engineering