I personally feel that Musk's strategy is that any publicity for his companies is good publicity, so he puts himself out there trying to connect popular themes

I personally feel that Musk's strategy is that any publicity for his companies is good publicity, so he puts himself out there trying to connect popular themes like cryptocurrency to them in any way possible. Other practitioners of this strategy that come to mind are Richard Branson in business and Donald Trump in politics. Their number one priority above all is to dominate the news cycle, which equates to free marketing. Given the above, I highly doubt that this (or the original adoption of Bitcoin earlier this year) is due to any deep feelings he may have about the merits or otherwise of Bitcoin itself. I also predict that he'll soon reverse himself publicly all over again.