I didn't get your point, could you be more specific please?

Because anyone can create 0% fee pool anytime they want, you don't need to quit the game for that. And there is no restrictions about this.

However, if someone creates a 0% fee pool, than there might be too many people joining this pool. If there are too many members, than the prize will be shared between too many players. Which means the earnings per player will be less. So most probably, clever players will go for higher earnings instead of 0% fee, crowded pools.

If pool owner quits the game, this harms only the pool owner. Nothing changes for pool members in terms of their earnings and their costs.

There is a cost of creating pool, if the pool owner quits then he would lost this paid cost + fee earnings + mining earnings. So the only person who is punished is the  pool owner that quits. Everything remains the same for the pool members.