I was able to withdrawal when I won my pool. Only reason I know is I always withdrawal several times after I win during NASCAR season. And I won that week. Maybe rules have changed?
but mine was split so won just $50 cause it was just a small NASCAR pool.
For for those that didn't know, 5dines offers NASCAR pools
for every race during the season. U pick from like 10-15 h2hs and winning car # is the tiebreaker