These guys aren't team mates, they are queuing together using Discord. So there already aren't HUD icons and damage is already enabled, since the game treats them as enemies of each other, not team mates.
And they seem to be coordinating just fine despite the difficulty, as @StangV2_0 describes. It helps that COD DMZ is much less hardcore than Tarkov. So strength in numbers does help.
Combating the phenomenon of people queuing together using Discord, is difficult. Since they could be scattered all over the country, a simple IP check wouldn't work. You'd have to implement something like a check to see if a player has clicked "join queue" at the exact same time as another player/s repeatedly, and then force those players to queue into different lobbies.
EA filed a patent surrounding this type of colluding: https://arstechnica.com/gaming/2022...edia-connections-to-detect-in-game-collusion/
They weren't Randoms, it was planned. There was no proximity chat so they were all on discord etc. Anyways, if you cant beat em, join em, Ill be bringing a team of 20 next time! Bitches.
Afaik you can make squads of up to 6 players, but pretty sure people will use something like discord to get around this.
We've teamed up into a squad of 4 before and sure it does give you an advantage as most players don't ever expect to see more than 3 people on a squad, however we've also taken down larger squads with just a squad of 3. I don't care too much as it's easy enough to pick up guns again and most of the time I'm removing guns from my stash as it's mostly full anyway.
Also prox chat can be turned off in the settings, clearly most players just click "auto detect" and run with it, as tons of 3 man squads have their prox chat on. I don't qq with randoms so it's perma off, will rather solo DMZ or BR than play with randoms.