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I think that's a pipe dream; he's rich far beyond the level where people escape accountability. Trump winning and giving him a cabinet position is significantly more likely, at which point - if he accepts it - the world is in for an epic shit storm even worse than what we'll get if just Trump gets back in.
The best reason for Musk not to accept such an offer would be that -if there's anything left afterwards - he might actually go to prison for his involvement in the lunacy.
I suspect it will all end in tears (prison) for musk.