Fuel for the feud was provided by the fact that X/Twitter itself has a long memory — an archive that Bluesky et al will always struggle to match. Musk, furious that Trump's "big beautiful bill" would increase the deficit, started posting quote tweets of every time Trump had promised to lower it, adding snarky comments in agreement.

Elon Musk, CEO of Tesla and self-proclaimed "First Buddy" of President Donald Trump, has stepped up criticism of the president's massive tax legislation in recent days. Investors are starting to notice.