You probably speak here more about the non-anon. games, where to play when one is 2600+ with players under 2400, and even worse, 2300, is very risky: most will attack you (even sometimes 3 vs. 1) and quite often the opp (especially if he is under 2300 and doesn't really understand the game) will remain passive, simply developing and looking passionlessly how they're killing you.
That's why I never play non-anon games with a level which differs from mine by more than 150-200 pts. Far too risky; you finish 4th quite easily without making anything wrong, but because you have an incompetent idiot in front who understands nothing about the 3 stages of a FFA game and their basic characteristics. It clearly doesn't pay: when you win (after often a very hard battle) you get 5-7 points and if you lose being 4th, the punishment may be easily -30/-40. It's not worth.
(Anyway, with the reform that will be implemented soon, with automatic Solo for high-rated games, the problem will be over!)
I m not rated that high in FFA. It hovers around 2600. This is because whenever I join any que less than 2400+, I often get targeted by my neighbors and my opposite goes passive. Then one of the neighbors blindly attacks me, giving the other neighbor the win.
The difference between humans and wild apes is that we have a larger brain that allows us to think and not just act on impulse. If you see a high rated player and you have the urge me want attack high rated. Me want do this, despite the fact that doing this is not strategic, then you're probably not using your brain. In fact, you're really no better than a wild ape. This seems to be how a great many FFA players rated lower than 2500 act though.
It's easy to ignore at first, but when it happens game after game after every single game... you realize that FFA is largely populated by people that just simply do not take time to think. And this is precisely why many teams plays don't take FFA seriously.
I really held nothing back in sharing my thoughts on this in the following game where I was targeted, and the guy who targeted me clearly shared how he was blindly attacking me due to me having a higher rating, which isn't even that high: https://www.chess.com/4-player-chess?g=11160689