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Profit. Vtubing as we understand it is an outgrowth of western cultural division of which a runaway Overton Window scenario is the primary cause. In the US a group of companies who employ many ex-government employees are deliberately blurring the line between the government and the market. It's believed that this group is led or controlled by extremely wealthy people who are primarily concerned with humanist doomsday scenarios, having finally eschewed all other religions with relative totality as the Baby Boomer generation dies away and cedes power to the millennial generation within this empowered group. Consequently they've conglomerated media power to project left wing politics to the point it generates the Overton Window runaway scenario. This scenario generates alienation in portions of populations far away from the aperture of the Overton Window, this means large segments of the populace aren't being marketed to well and creates a vacuum for creative products and media that bypass the aperture.
To make money from disaffected right-wingers in the west by taking advantage of scenario which generates a large marketing coverage gap as part of it's normal operation. We're the gold that's being rushed to, here. Lefties won't entertain us, or men in general, and our wallets are too full.