I'm a bit surprised that this fight with the POTUS doesn't have a stronger influence on Twitter's stock value.
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People on Twitter are mostly not voting for Trump. Trump voter demographics are roughly white male rural middle-income evangelical non-college-educated over-50, and this does not overlap much with Twitter user demographics (80% millennials).
So Trump has nothing to lose on Twitter, so he can't lose. The goal for his tweets is to make a big story, and Twitter intervening makes it an even bigger one.