The site acts as an unintended archive. Many official English localization companies go bankrupt, or Japanese developers stop selling older titles. Ryuugames often keeps these games alive and accessible for the community long after they have disappeared from official storefronts.
While Ryuugames itself has a decent reputation compared to random torrent sites, downloading executables ( .exe files) from unofficial sources always carries a risk of malware or viruses. Users should always scan files with an antivirus program before installing. ryuugames site