You have to wonder why Doge when there's BTC. I'm not sure if I have the order of tweets correctly but fisrt coin mentioned by WSB was Doge, second was BTC, then the last I saw was Link.
DOGE did do $21 billion volume today, which is quite impressive and makes it #4 among all coins traded. While the price of BTC could definitely be moved for that much money, the effect wouldn't have been as impactful on BTC's market cap and easier to diminish.