Playground is gonna end up being an even bigger moneymaker if they handle it right. It's essentially a minecraft/starcraft map/game builder with endless options. Basically a DYI, entry-level Unreal engine editor.
Hamlinz was messing around with it the other day and they straight up built an enclosed arena with bounce pads on the floor and walls. Then they had a rifles only/bounce match in the arena that was like some throwback Quake 3 Arena space map.
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Then they were fukking around even more and made an enclosed maze, turned off the HUD, and made a "hunter" game where one dude gets a weapon and the other 3 were hiding in the maze.
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I thought Fortnite would eventually get stale, but if people start making games within the game ... this thing might be in it for the long haul.