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Loud wire is about to get chewn out by me for the number of ads on their page, basically making this article unreadable, but here:
To save us all time (and avoid being advertised to):
The crypto posts were because his account got hacked, much like Metallica's last summer. He's basically fed up with this bullshit and is leaving Twitter.
I'd also be inclined to believe this was the final straw after the nazi salute, which the salute should've been the final straw in the first place, but that's just a theory so take it with a grain of salt.