In 2018, a public outcry from Fortnite players seemingly pushed Sony to finally support crossplay on the PlayStation 4. Until its big shift with Fortnite, Sony had repeatedly chosen not to support crossplay for other games like Minecraft and Rocket League. Newly-released documents from the Epic Games v Apple lawsuit now show how Epic tried to negotiate with Sony for crossplay, and that once Sony did finally allow cross-platform play, it began charging developers based on how much their game earned on other platforms.
In a 2019 Sony document titled "Cross-platform revenue share," Sony outlined a royalty payment policy for games that earn a significant portion of their money on platforms other than the PS4. "If the proportion of PSN Revenue Share divided by the PS4 Gameplay Share for a title is less than .85 in any given month, the Partner will pay SIE a royalty to offset the reduction in revenue."
That's a bit dense, but the gist is that Sony wants to ensure that PlayStation players aren't running off to spend their money elsewhere while still relying on Sony's servers/infrastructure.
Sony's example chart breaks down how its royalty payments would work. It shows how a game earning $1 million in a month across all platforms would owe Sony no crossplay royalties if $900,000 of that total came from PSN, while 95% of the total playerbase was on Sony's platform. In that scenario, the PSN revenue share works out to 90%—above Sony's 85% threshold, meaning no royalty is owed.
Sony's justification for the royalty payment seems to be its way of ensuring that if a ton of players are on its platform, it's going to see a proportional amount of revenue on PSN too, where it gets a 30% cut of in-game purchases.
If 20% of the total Rocket League playerbase were on the PS4, for example, but PlayStation players accounted for only 10% of the game's revenue (because players buy way more skins on PC, or something), Sony presumably thinks it's paying the PSN infrastructure costs for all those players but not getting the return it should for allowing cross-platform play. To "offset the reduction in revenue," the game publisher would owe Sony a royalty payment based on the gap between the PS4 playerbase and proportional PSN revenue.
To enable crossplay under the agreement, developers are required to share monthly reports with Sony detailing the PS4 revenue share.
Based on this document, Sony isn't outright charging for crossplay on PlayStation, though it is just one page from what seems to be a larger policy packet on crossplay. Only the revenue share page was submitted for the Epic v Apple court case. Since the document was created in 2019, it's possible Sony's approach to crossplay has changed in the last two years, but according to Epic CEO Tim Sweeney, Epic had to agree to the terms for Fortnite crossplay to be allowed on the PS4. "If somebody were primarily playing on PlayStation, but paying on iPhone then this might trigger compensation," he said in court on Monday.
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