>It does seem very odd that "someone" can just claim ownership, file a lawsuit, and someone else has to defend themself in the face of a masked accuser whose motives, funding ... and even their own claimed ownership

That fact pattern is absolutely not normal. That's why this raised so many eyebrows and actually got looked into.

Edit: Lawsuits invariably establish "who" the plaintiff is and their relationship to the defendant because this is almost always a byproduct of determining that they have and the extent to which they've been (allegedly) wronged by the defendant's actions.