For reference any time I use the word trigger I mean your account gets a sort of book mark in Kabam’s system for suspicious behavior.
You can grind arena for an infinite streak as long as it’s within the first 30 to 60 days of your account being created. After that be careful in arena and only go for champs you really want or not at all to be safe.
The trigger for an Act 5 ban is going uncollected, so you can explore all quests up until the Collector’s quest (5.2.6). I also believe the first completion of Act 5 has a ban trigger, and this is unconfirmed but can be assumed that all Act 6 chapters have triggers on them for now.
Low tier alliance quest shouldn’t get you banned, but alliance war might if you act suspicious. My strategy in a war is to go on a path with damage over time nodes, or if I don’t get on of those leave a fight so it kills one of my guys. If you want to do quests look for a full blown hacker alliance, so you don’t get reported in quests.
You can’t go for speed runs in events however to my knowledge they don’t ban for event quest hacking, or at least it hasn’t happened to me.
I haven’t tried varient yet but I intend to try it once I get to level 40 and have a few good champions on my current account. My assumption is it also doesn’t have triggers like most in the event quest tab.
Realm of Legends you can do after a few decent champs it usually doesn’t trigger any checks in their system, but don’t go talking in global chat if the 4 stars in it will be your top 4 champs. Labyrinth of legends I believe has triggers on all fights so avoid that until you know you can knock it out in like an hour to decrease the damage of a ban. However to my knowledge Road to the Labyrinth doesn’t have any triggers to it, it would just take awhile early on if you don’t have to VIP hack (which I don’t).
For Dugeons idk if their are triggers for, but if you make two accounts you can avoid random matchmaking and the risk of being reported if you still want it’s rewards.
This is all the advice I have, but also just don’t talk in global ever.