Worldwide digital spending declined 2% in December to $9 billion, driven primarily by a 21% fall in the premium PC market according to SuperData.
The market intelligence firm also reported a "single-digit" drop off in mobile which was offset by a 12% rise in console spending.
Fortnite continued as a dominant force in console for the period, driving a 209% increase in the free-to-play segment.
There were no real surprises in the top-grossing games across PC, mobile, or console with League of Legends, Fortnite, and Honor of Kings topping the respective charts for worldwide revenue in December.
Fortnite saw its highest-grossing month to date while PlayerUnknown's Battlegrounds sold 2.75 million units across console and PC.
Super Smash. Bros Ultimate was the best-selling console game for the month -- with an estimated 2.49 million digital units sold, it's also the best digital launch on the Switch to date.
Counter-Strike: Global Offensive is finding solid success since going free-to-play and introducing a battle royale mode, with MAU hitting a high point. SuperData estimates the free version generated roughly $49 million for Valve between November and December.