Intentional inactivity is legal - we measure intention with a combination of post frequency and read time. A player will only be flagged as illegally inactive if their post frequency AND read time are both simultaneously below a threshold for some time period.
In other words if a player posts they’re fine and if they don’t post but spend enough time reading they’re also fine.
We’re working on tools so this information can be automatically supplied to game hosts and to automatically flag problem players.