Zhao Youyue did not expect such a drastic rise in viewership, just because she had erroneously played a money spamming card game by accident.
The effect of live streaming a Summoner's War'esque game is not exactly harmless. It was probably similar to those types of ship collection games. One could have great fun by playing alone. It would give a sense of accomplishment, as one's collection grows. But when it comes to a whaler live streaming, it would only give rise to the envy and jealousy of viewers who played the same game.
Usually, active, unpredictable streamers who were constantly on the move, killing their enemies would attract several viewers. Audiences would be placed in the very seat of the gamer as he or she carves up a path of destruction.