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The easiest way to keep Cover in the game long term would be to release a Hololive Gacha, with EN members too.
As much as a hate gacha (never spent a cent on it), whales would keep it afloat for years if the gameplay has a good interaction loop and you could also pay a cut to the girls if they sold outfits / costumes separetely.
Do you think they're at least brainstorming about it?