He's manipulating a toy coin.
I think it began as a joke, just like the coin itself is a joke.
Then he noticed the idiots were real.
It's like when you post something sarcastic but everyone understands it literally. You then realize people are idiots.
That's what's happening.
If he were manipulating something like Bitcoin, which corporations own in their balance sheet, it'd probably have consequences.
So he chose the most ridiculous and worthless of all coins to play with. Can't say you're manipulating anything when you're fooling around with "dog coin".