Yes it was!

I just posted a comment about how amazing the warcraft 2 community was on AOL. Couldn't remember if they charged per minute or per hour so you just confirmed it for me. I just remember that some kids were racking up insane bills. I had to play on Zone (and then Battle.net when Battle.net edition came out) but I loved the AOL war2 message boards.

It is not and has never been an AOL game. Unless you were paying by the minute for internet access for multiplayer via Kali.