Elon is saying that he started going after Trump because the Big Beautiful Bill won't reduce the deficit. That's a load of horseshit. Why would Musk care about the US deficit? After all, DOGE's real mission wasn't to cut government waste, it was to mine for data. There are a couple of other theories. (1) Trump pulled Musk's pick for NASA chief, who happens to be a buddy of Musk's and could have helped advance SpaceX. (2) (According to Steve Bannon, anyway, so take it as you will), Elon asked Trump to extend his tenure as an advisor, and Trump refused.
Whatever it is, Elon is just a rich, autistic retard scorned.