As others, I don't see participation in the actual battle being an issue, but the Unity chat being the means to advertise it can be one.

Quote Originally Posted by BobbinT View Post
system already does kick out inactive players on unity chat, iirc even kicks while I'm still moving but never use chat channel.
Does it? I have never seen that happen as far as I'm aware of things (well, seeing idle people removed could be kind of tricky... unless one was the idler themselves, and while I usually do log out when not actually at home/awake for a longer period of time, there have been times when I didn't, and was not kicked out... I think).

As far as I can tell, characters are (only?) removed when changing areas, but I could be wrong.