As suggested by the title, forums use should be limited for players who have in-game punishments such as a mute or ban.
This would mostly apply to chat-related incidents such as encouraging hatred, death threats, malicious links being posted in chat, harassment, etc.. Of course, this would be to prevent the player from causing further issues even past their in-game problems, that time on the forums. These players should still have ability to post appeals in the appeals section or file reports, but not be able to make posts visible to the whole forums or interact in conversations. Once their punishment is up, they may return to normal use of the forums.
This would mostly apply to chat-related incidents such as encouraging hatred, death threats, malicious links being posted in chat, harassment, etc.. Of course, this would be to prevent the player from causing further issues even past their in-game problems, that time on the forums. These players should still have ability to post appeals in the appeals section or file reports, but not be able to make posts visible to the whole forums or interact in conversations. Once their punishment is up, they may return to normal use of the forums.