Here's a simple example: when you're paying a subscription, you're receiving special currency. You can spend it to buy various cool stuff like TCG mounts and plenty of other things, if you're dedicated WoW player for years. There's gold token in WoW Classic. There're time restrictions and chat restrictions for minors (WoW desperately needs that).
Basically if you're a dedicated WoW subscriber in China, you're getting respect and gifts. If you're a dedicated WoW subscriber in EU, you're getting nothing.