Large chunks of the Internet are run on *nix and more often Linux these days. For example, over 50% of the web according to Netcraft (Assuming Apache = *nix is sensible I think).
The trouble with that stat is it counts web sites, it doesn't count traffic or users - there are some huge sites running on *nix and there are some small ones (one of mine, for example); similarly, there are some massive Windows sites - just a raw count doesn't really tell us anything.