I believe the official servers are currently running EAC while they are in the process of implementing FACEIT, but I'm not 100% sure.

I stopped following development after they announced they were switching to FACEIT.

Bummer. I was really hoping to see "Due to popular demand, we have decided to abandon our plans to implement FACEIT's draconian anticheat, and continue to use EAC for official servers in order to support Linux." Oh well, a man can dream.

Guess I won't be purchasing this game anytime soon.