"Should James choose to leave the Cavaliers, Fanatics, the world's largest licensed jersey seller, would be on the hook for potentially millions of dollars in exchanges"

ESPN:

The brand softly launched a program called Jersey Assurance in November that allows fans to exchange a player's jersey free of charge if that player changes teams within 90 days of the purchase. The company more boldly announced the details of the program in January, with an additional partner in American Express. If an NBA jersey was purchased with an AmEx card on Fanatics, that fan got a year to exchange jerseys if a player is no longer affiliated with that team.