Earlier quoted context omitted.
It could just be a relatively unsophisticated actor who stumbled upon a serious vulnerability and didn't know enough to market it to, eg, a state actor or whatever.
What would a state actor do with this? Read celebrities' DMs?
Besides public state and company size, Twitter is also new media. And all media is information warfare. (Hmm, that sounds a bit strong, especially considering the toxicity that is the platform itself; I mean the term generically speaking.)