Last year, one of the largest vtubers, Ironmouse, did a charity event to raise money for the Immune Deficiency Foundation. Two days ago, Ironmouse just revealed that the IDF had received none of the $500k charity donations she raised. Apparently someone at the agency she was contracted with had embezzled the money. This has sent the entire vtubing community into an uproar, effectively annihilating the agency overnight, and re-raised $1 million donations for IDF over the span of two days.

Currently, my most watched would be Kanna Yanagi. (probably a bit obvious with how many of my posts include her)
I think why I watch her so much is because she's reliable. She's streams a lot, so there's always more to watch. She maintains a comfy and wholesome vibe, so I don't have to worry about "stuff" like world news or internet drama while I watch. The big collab events she joins or organizes are also a bonus.