Yes it is but if people like Greg Hardy can get multiple shots at the NFL, Jalen can get one. Quitting definitely sends a bad message but most will look the other way.
Hardy continued to get opportunities because he was an elite talent and player at a critically important position. Hurd has none of that going for him.
That being said, I think some team takes a flier on him in the mid to late rounds. But given that he simply doesn't have the feet, burst and speed to be a great NFL running back, I don't think his stay in the league will be very lengthy.