Being pre-revenue doesn't mean something has no value. They are calculating it based on what value they deem it to have. If the stolen tech is of vital importance to producing a product that could be worth a nearly 3 billion dollars, then that's what they'll sue for. Actually they'll sue for a bit more, but that's roughly how it works. Like anything, it's better to ask for $10 when someone is only willing to pay $8, than to ask for $5 when someone is willing to pay $8.