Been following a few speed games they played this afternoon. They certainly seem to avoid attacking each other, at least in the games I watched one attacked the other once and he took a 1. They always seem to be the last two players left and then, obviously, one of them wins.
Example: Game 11943799
lorisb takes out yellow, even though it would have been easier to take out Elyy. They're the only two players left. Elyy has 1 territory and 3 cards. Cashes in and nukes himself! lorisb wins.
Another one: Game 11943806
Basically the same thing happens. Only here lorisb takes out blue, instead of the easier target Elyy. Could have continued to attack Elyy, but didn't. Instead, Elyy cashes in his 3 cards and nukes his own stack, after which he has 1 army left. lorisb wins again.
These two should be blocked from playing each other.