I'm Sure I've Seen That Before Somewhere.

TL;DR

Elon Musk's inauguration speech included a gesture that has drawn controversy.
Online reactions and some media outlets have likened the gesture to a Nazi salute.
An alternative interpretation is that Musk was miming giving his heart to the crowd, consistent with his words.
Musk has a history of supporting Germany's far-right party and has sued individuals for associating him with Nazis.

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