Because they’re always traveling, and they don’t recognize the court.
Explanation: This joke plays on the concept of “Sovereign Citizens,” who often believe they are not subject to government laws, including court rulings. The punchline suggests that they are “always traveling” because they don’t acknowledge legal jurisdictions, making it impossible for them to participate in a basketball game, which takes place on a court. The humor arises from the intersection of legal jargon and basketball terminology, creating an absurd scenario.