They were pretty big at one point, though they've been losing traction. Their investors seem to have fairly deep pockets (hundreds of millions). Their software (game maker and client) are really well-developed and excellent. The crypto means you can trade any game assets freely, which is great, but also traditionally made it hard for new players who aren't into crypto (they just added credit cards).

Probably has the same resources as Facepunch, but nowhere near the following or players.