Well, it's almost thirty years old movie and not the most popular one starring Sandra Bullock, so I think it only makes sense if people today don't know it as opposed to Speed, for instance.

I only mentioned part of the plot, which I thought was necessary when describing Sandra Bullock's role. There is a bigger picture and antagonist's motivations in it that I haven't mentioned. The situation Bullock's character ends up in is indeed dire; she only manages to turn it around thanks to her knowledge and expertise regarding computer systems, otherwise it's one of the worst nightmares anyone can imagine of becoming reality. In The Net it's not a game.