It's a fad, it has been a long time coming. The US, and then the other plebdoms, is adopting a mirroring fad, where they nerd over Japanese stuff, while the Japanese have been nerding over USAn stuff for how long, 40 years?
It's a foreign culture, easily accessible and easy to claim to be a fan of since they are cartoons with better visuals and a plot. Most of the appeal comes from the world-view and sensibilities of a foreign culture. Once you become accustomed it becomes preditable and boring, revealing the horrible secret that it's the same kind of pasty dribble that haunts the western media, but the paste was made in japan.
2026 is going to be all about the eastern european animation, just you wait.