Welcome to potd solo runs, the home of desperation and grief.
Its been like that forever and plenty of good runs got canceled like that.

It can be abused, yeah, that is the issue. Are there ways to prevent it ? Yeah possibly. They could give you a 2nd chance for each floor when you dc, so you restart from the starting floor, maybe reduce the starting timer by 10min as punishment, but at least it is not all gone.