How do you even play from two accounts real time? isn't that too much work and you might miss something.
2 devices, 2 browser ot logging in out quickly.
It is very bad to boot right after timer hits 0.00 and well-some people are just wanting the free points as they're too bad to win through proper play.
No, it's not. By joining a game with, say, 5 minutes boottime you agreed to play within that timelimit. If you exceeed and get booted, it's your fault, not the enemy's who booted you.
Why using two accounts is not allowed in FFA?
Gives you an advantage. Read the ToS.