Oh it's interesting - you need to pass a 100 questions entrance exam to be a member, it's a user-generated platform not dependent on ad revenue,

-The most interesting feature of Bilibili—and the one most central to community—is bullet commentary. When you consume content on Bilibili, comments from fellow community members flash across your screen, time-stamped to when that user had that reaction. Only members of the community—those who passed that 100-question exam—can leave comments, ensur... See more

Every single social platform in the west that I can think of focuses on reducing the registration friction, it seems like a no-brainer esp if your priority is the growth of the platform. Bilibili’s process seems counter-intuitive until you factor in that its aim is sustainable growth. Sustainable growth means that they want to let in dedicated memb... See more