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 as its easier to diminish, given how much more liquid its market is than Dogecoin's.
So WSB wants to show the same huge green candle to mimic GME and that's easier to do with DOGE.
I'm a bit late to the party, but is that DOGE stuff actually connected to WSB (Reddit)?
I've seen nothing about it in
https://www.reddit.com/r/wallstreetbets/ (I guess that's their sub-Reddit, /wsb/ is in private mode), or on
https://twitter.com/wsbmod (according to the side bar, the official Mod Twitter account).