Why is Shanda called several dragons?

The two are the relationship between the parent company and the subsidiary company, and the dragon company is more powerful. Adventure Island has always been a dragon and grand game, meaning parent company and subsidiary company. Now Shanda is not as good as before, and the shares of the parent company are falling apart and may change hands soon. A few bugs can make money by their own games, and they have some skills, so they start to make their own decisions and don't play the banner of Shanda, so Shanda uses the name of its subsidiary to ensure its popularity.