If its been 8 years, or whatever, if they were going to do something about it they would have already. 
Almost 9, IIRC. FS2 was released in september 1999. But that regardless, you're right. I don't know how long this forum has been activly condoning the download of FS2, but AFAIK,

staff has come on here before and if they didn't say anything, they don't care enough to make such a big deal out of it, and if they didn't notice it, then they never will. And Interplay IMO deserves to have this game pirated after the crappy job they did at publishing this. Half-Life should have been the game getting eclipsed by Freespace 2, not the other way around.
Quite simply: No one cares. Stop your worrying.