He likes meme? well, Dogecoin is the coin that he saw that he can easily manipulated because there's no more control on it and it got an unlimited supply.
The devs were already out and it's now going to be there until all of us stops buying and using it. Elon just sees the things that we don't with things and that's why he's successful and many hates him if it's related to crypto.
i think elon like doge coin cause he have possibiliy by manipulating market to earn as much as profit he can. when we trapped in his game and againts the markt direction we will easily loss our money. When decided invest in crypto market , elon know that he can doing alot things with this popularity and dogecoin maybe be the first test for it.
I once read in a reply to a tweet on February 24 when Magnus Carlsen asked Elon Musk why he likes Doge Coin? then he answered it with very simple words, because he likes memes and dogs, this is indeed a reasonable answer, but according to my personal assumption he likes doge coin because he can get big profits in a short time by manipulating prices.
that is the true answer why elon musk continuesly shilling doge coin, profits be main his purpose involved in this market. He saw this market have huge potency to growth more than current condition , he exactly right when use his power to influence investors in doge.