Haven't played that in a while so a quick check on Wikipedia stated it was just two modes of play with anyone and play with friends.
Quote:
Online multiplayer games can be played either with registered friends or with randomly selected participants.
Additionally, players can converse with up to four phrases that are preset by the player, which appear as speech bubbles when activated. These names and phrases are not displayed in random-player matches.
The Spectator mode allows players to watch matches being played between other players, and bet on the outcome using coins earned within the game. The winner of the match earns a jackpot of coins.
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Think the CPU taking over people who left games also only occurred in the Random/Anyone mode and not in Friends mode.