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Gamers was kind of a transitional period from gen 2 to 3. Mio was apart of holo marketing, but Korone and Okayu who came later were handled a bit differently. The point about marketing is something I like to bring up since newfags don't know about this. Gen 0, 1, and 2 were the main talents featured in marketing with gen 3 getting appearances in 2020 after Holo 1st fes.
You can learn more about the sponsorships that don't get talked about on the seesaa wiki, it has their sponsorships in the Hololive timeline.
Back then the thing I cared about was Okakoro being placed in the group photo which was Hololive's banner. They were placed, but stuck out like a sore thumb because they were in their original outfits while everyone else was in their idol outfits (including Mio).
For reference, brown guy is matsuri bandaid/fubuki scatman clipfag. Although you could argue that's pink girl considering Gen 4 happened a month after those 2 clips. Feels good being a green bro.