The reason unicorns exist isn't because they're a very small niche that found their way to vtubing, it's because falling in love with cute girls and believing they love you back somehow makes men feel good and seeing them like other guys makes men feel bad. Unicorns were just a bunch of dudes letting themselves remember how lonely they are. They aren't a niche. The majority of english-speaking male zoomers and young millenials are incels. Men are incapable of acting like decent people without feeling the romantic love of a woman(if you've insulted another person in the last month it means you're not decent, if you want a dictionary definition). So of course unicorns exist. They happened because people let themselves care. Unicorns are what happens when a man cares about a girl. It's not rocket science.