Trump isn't smart enough to think this through. After all, he's the one who suggested injecting disinfectant as a covid cure. I wish he'd tried it himself.
Also, for US citizens receiving income in USD and spending it abroad, well the strength of the USD is partly due to it being the reserve currency. There's nothing to be gained from the US backing entirely speculative and unregulated crypto "currencies". In the event that such actions add legitimacy to these, it weakens the position of the USD.
I'm not a US citizen. If it were my country, I'd want an intelligent and principled right wing candidate. Trump fails on both requirements.
I've got one of Trump's books from a couple of decades ago somewhere. It's appalling. He seemed to spend all day embroiled in litigation & from what I could tell, much of it was down to his attitude issues.
The Republicans ought to be ashamed of putting such a candidate forward. Again.
It's almost equivalent to electing Hitler, a few years after he was arrested for attempting to organise a Coup in Bavaria. That didn't go too well.