It's mainly that if someone isn't a casual player, then you have to ask what they spend the entire year doing in the game. For many that's just collecting achievements or mounts.
They react to reports. It's really that simple. They don't patrol around the streets like a police officer. If nobody reports it, it does not get actioned.
My answer stems from seeing multiple translations and also interacting with them a lot on the cloud test DC. I made a JP friend there for a few days and we talked via translation. I've also had to convert things to Japanese in a server I'm in and I had to do a lot of research to understand their terminology, including reviewing numerous news articles that discuss the culture and drama in the game, and every time you realize that they're not so different over there.
No, what I think has happened is they:
- View casual content as spending a few minutes clicking mammets or doing a beast tribe quest.
- View midcore content, which we can define as spending more than 5-12 minutes playing, as Extreme, Savage, Chaotic, etc.