Like Elon Musk's previous reason, he is only successful with this coin meme according to him. and another reason he bought the coins as a collection for his son. But if you look at the price that continues to skyrocket higher, it is possible that Elon Musk has done a great business trading Dogecoin.
he certainly bought it maybe at early phase, buying it because he collects it for his son is such a LAME excuse, no billionaire gonna go that far to shill it if not for their own benefit, they become a billionaire for a reason after all
but right now it seems the doge market has been out of ELON control although most demand comes from ELON's shill about it being the future leading coin or or how great it is but people seem have gotten tired of elon
and instead the market moves on its own course, hope things stay like this though, market manipulation like that isn't healthy even if it pumps the market, it could cause bigger crash.