Swaps are only permitted for Daily contests. Swaps will not occur in season-long Best Ball.
Best Ball
When players are traded in real life or retire, entrants will accumulate points based on the player's performance on the new team. Entrants are not permitted to swap players, even if a player in their lineup is no longer eligible to earn points.
Daily
Traded/Injured/Retired or otherwise inactive players will be swap-eligible in daily drafts if they become inactive prior to the contest's listed start time.