It was definitely the go-to abbreviation during the early days of the internet, at least in my circles. Nowadays we’ve become so anglicised that everyone just uses English norms instead.
I remember using asg as a kid/young teen, and I remember people at the time were looking down on those using “lol” or “rofl” instead, calling them silly posers.
I haven’t played this since I was a kid but I used to have such a good time with it. I had almost forgotten about it so this was a great blast of nostalgia. I guess people are still playing it? Warms my heart.