In any chess tournament, a player clan claim a draw when the FIDE rules allow.
For example, a player with Queen and King can not be checkmated by a King and a Bishop and can therefore claim a draw (insufficient mating mating material).
When this player times out, the game is counted as a draw, not only in OTB but other chess site have auto implemented these rules.
I suggest this site plays by FIDE rules as well.