I mean, GFL already has Pekora (Eastern Front Warcrimes Edition) and Botan (Extra Hag Edition).
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But what kind of gameplay or setting would a Hololive gacha even do? They could flip some Alternate assets for a Genshin clone, but that takes a lot of fucking work to do well, they could do some kind of Raid Shadow Legends clone that's just a game that plays itself. For the setting or plot, I can only really think of Holocure: But Gacha, because Hololive doesn't really have a, uh, dedicated enemy faction, I guess?