Yeah, the accounts in the game you linked are likely operated by the same player. If you report them, a moderator can check their IPs and confirm that.
Due to the nature of FFAs, any 3 FFA will usually turn in into a 2v1, cause fighting only 1 front is a lot easier. So if you play 3 FFA, make sure you're in the 2 side and not the 1 side ;)
I'm curious, if you think reporting a multi-accounter to the mods isn't a solution, what on earth did you think making a forum post would do? It's not like the rest of us can ban them.
People playing from communal areas also have same IP (school, workplace, coffee shops, etc).
People living in same building also have same IP.
VPNs completely make IP checking useless.
Using same computer could be the result of shared computers like family members, friends, other students and coworkers.
What you need is browser fingerprinting alongside IP checking and which accounts are linked with which. I don’t think Warzone currently has browser fingerprinting.
All the reports are dealt with by volunteers and only Fizzer and a very select few can perform actions. The others are like a filter to make sure only good reports come through and enter suggested warning/suspension message and any admin notes.
I’ve made a mod called “Host spies on and can eliminate players” that you can use for this sort of thing. If you want to create a game with it but don’t have a membership, ask me and I’ll be able to make one once per week