Matsuri did first.
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I don't think it's surprising that womans who are knee deep in otaku culture, a culture degenerated by it's very nature, atention seekers enough to become big vtubers and generaly to much of weird nerds or menhera to go to a club trying to get dicked (or in matsuri case fingered) down would go to e-whoring as a means of relieving sexual frustation. Vtubers are mostly the type of people that 10 or 20 years ago would become Otasaa no Hime
Have you come across the “queen” or the “diva” of a certain group, at some point in your life, like ...
tokyogirlsupdate.com
Edit: I forgot to say that Hanna doing that is probably because Matsuri doing the same had essentially zero backlash and that give her courage, I think because of Matsuri success we gonna see more of them doing more horny content