Only 7 of the last 58 NBA Finals champions did not have an All-Defensive Team player. Only 4 of those 58 Finals did not feature any ADT player.
1975 champ: Golden State Warriors (The Washington Bullets as the runner-up had an All-Defensive Team Player.)
1978 champ: Washington Bullets
1981 champ: Boston Celtics
1995 champ: Houston Rockets (The Orlando Magic as the runner-up had an ADT player.)
2006 champ: Miami Heat
2016 champ: Cleveland Cavaliers (The Golden State Warriors as the runner-up had an ADT player.)
2023 champ: Denver Nuggets (The Miami Heat as the runner-up had an ADT player.)
EDIT: Only 3, not 4. Forgive me, Nico!