This site doesn't appear to be any more legal than the other ones you expressed concern about. Look on their license page.. They don't have the legal standing to offer you these games for non-commercial use, they're just operating under a legal theory that pirating abandoned games for non-commercial use is legal (or at least it's not going to get you or they into trouble). Very similar to the underdogs website theory (http://www.hotud.org/).

Factor 5s first game as a free download for everybody who loved the Amiga or just plain historical interest – also known in other parts of Europe as Denaris. 50 frames per second of high-adrenaline shooting action very reminiscent of R-Type.
Note: This only works 100% with the UAE emulator .
Katakis, R-Type and BC KID are not provided for the public domain. You are entitled to download and use these games only for non-commercial purposes. All copyrights are retained by their owners. Any distribution of this data through any medium unless specifically permitted by the copyright owners is not allowed.

That's the thing with anonymity, isn't it? Anyone can be anonymous on the internet. Isn't one of the main ideals behind anonymous that it cannot be false-flagged? Notice how the media and even /. is trying their hardest to portray anonymous as a single, organized group.

Only after you observe the game's ending will you discover the game's plot:
You either attempted to save the Princess from the evil clutches of King Kupa,
or it's another case of Mario going mad and destroying an innocent kingdom for no good reason.

Why has something like Quadrapassel (tetris on Gnome/Ubuntu?) survived?