There are in-game rewards and visual distinctions for players with large played time.
On "New Logon WoWCircle loyalty system and voting changes" there is no update scribed in the russian version:
Изменения в системе лояльности от 19.03.21
Теперь за общее время проведенное в игре на персонаже положены награды(считается онлайн на одном персонаже /played): ...
Briefly (cumulative rewards):
* 150 days played on one character ("/played"): visual effect
* 250d: custom mount & two visual effects 250d
* 500d: custom mount & visual effect 500d