Apple insisted that in the interests of justice Valve would have to turn over shedloads of data, much of which Valve did not keep. 

In addition to some aggregate sales data for the entirety of Steam, Valve will only have to provide specific, per-title pricing and sales data for "436 specific apps that are available on both Steam and the Epic Games Store", according to the order.

Apple will be somewhat miffed with the ruling as it wanted details of the 30,000+ titles Apple for which Apple originally requested data.

Valve argued that its Steam sales data was irrelevant to questions about the purely mobile app marketplaces at issue in the case.

Refocusing the request only on games available on both Steam and the Epic Games Store makes it more directly relevant to the questions of mobile competition in the case, Judge Thomas Hixson writes in his order.

"Recall that in these related cases, [Epic] allege that Apple's 30 per cent commission on sales through its App Store is anti-competitive and that allowing iOS apps to be sold through other stores would force Apple to reduce its commission to a more competitive level," Hixson writes in the order. "By focusing... on 436 specific games that are sold in both Steam and Epic's store, Apple seeks to take discovery into whether the availability of other stores does in fact affect commissions in the way [Epic] allege."

The California judge overseeing Apple's attempts to drag Valve into an ongoing beef with Epic Games admitted that Apple "salted the Earth with subpoenas, so don't worry, it's not just you".