In a three player game, does Sabotage reveal a hand to everyone, or just the person that played the Sabotage?

In a three-player game, when you play Sabotage, the opponent you choose reveals their hand to everyone at the table.

According to Rule 411.1, "Revealing is the act of presenting a card to all players from a zone that one or more players do not have access to the information of." Because the rule defines revealing as presenting the information to "all players," the information becomes public to everyone present, not just the player who played the card.

This is further supported by the RiftJudge FAQ #4862, which clarifies the sequence for Sabotage: "Once Sabotage begins to resolve, you reveal their hand, choose a card, and recycle it all as one action." Since the act of "revealing" is a game mechanic that presents information to all players, the hand is revealed to the entire table.