Well usually it was the crappier teams like Scuderia Italia, Minardi and Lotus (at the time obviously), that usually showed up, although at that time ferrari could be considered one of the crappier teams.
Remember this was back when F1 was slightly more light hearted and ridiculously expensive.
The Ferrari F1 team still do show up, but now its just demo runs and since 97 its been touring cars and F3000/GP2, Benetton were the last F1 team to win.
I know I might be a bit of topic but does anyone know how registry of Racing Underground works? If I do ask a wrong question because of anything please let me know... I've heard I could get there some motorsport action?! I've problems with an invitation code
edit: Yes, you can get some motorsport action. Here are the numbers:
Uploaded 1.87 PB (google: 1.87 petabytes = 1 960 837.12 gigabytes)
Downloaded 1.66 PB
Unfortunatelly i don`t have an invite code yet.
sorry for off topic.