It’s hard to even prove someone is afk intentionally so to be marked guilty until proven innocent is just plain wrong.
Personally, I think removing your character’s armour to avoid reparation costs and placing him in the exact same spot near the Static Knight on each fight for multiple days is a fairly strong indicator that is intentional. So is bragging about it in map chat afterwards saying that “they won’t do anything about it”.
The problem is not how often people AFK, because they do it only once. The problem is that it lasts for multiple hours/days, in precise key spots. It’s not the usual ‘brb phone’, it’s targeted, repetitive, and intentional. I’m not even sure you can call this AFK since the character is replaced manually in the same spot after each event.
I do not think AFKing itself is an offence (stuff happens), but griefing definitely is. And this kind of planned and repeated behaviour, is griefing :
