Metal Gear Solid 4's new re-release in Master Collection Vol.2 appears to reference a fan-made Metal Gear Online project in its files, suggesting Konami relied on the project for DLC.
Back in the days of the Xbox 360 and PS3, it felt like every game had a multiplayer mode, even if it didn't need it. Nonetheless, this trend resulted in some shockingly great multiplayer experiences like Naughty Dog's Uncharted and The Last of Us online modes, Capcom's forgotten Bionic Commando reboot, and Bioshock 2.