Many times, it's unclear who the eligible defendant is; user agreements are not omnipotent. There might be subcontracting companies, or situations involving joint operations.
"So what do we do, list them all as defendants? The court will surely eliminate those who are ineligible after a review, or the other party, upon receiving the summons, might argue their ineligibility if they see fit."
Of course, if you really sue a few, and all of them claim they are not the defendant—just like the labor dispute Old Tang ran into last time—then don't even think about it, just ask them to bear the legal fees and other expenses for rights protection in the subsequent litigation.
Anyways, now that there are guiding cases, if they object, they can go and try their luck at the Supreme Court.
Ju Haiqing was startled upon hearing this, "This, doesn't this seem a bit unfair?"