Earlier quoted context omitted.
In what circumstances would escrowed money be forfeited? If the escrowed money doesn't go to the parties, then there's no incentive from either side to consider the other side's escrow when determining their actions. Or worse - someone could file a suit and dismiss it later just to force escrow to be paid out. I think you need a lot more details on what happens in each scenario here.
The circumstances where the escrow IS NOT returned would be the forfeitures. You have to read between the lines since the comment only specifies when escrow IS returned. So, alleged copyright owner loses escrow when a counter claim is filed. The accused loses escrow when a lawsuit is filed. This detail isn't as important as the overall result. Those who engage in mass DMCA abuse will directly lose money as a result.
So all the alleged copyright owner needs to do to deprive the accused of $Y is file a lawsuit (which could be completely lacking in merit)? That is arguably worse than the status quo, unless $Y is trivially small, in which case it lacks meaning to begin with.