This website is based on an open source platform, but it is heavilly customized in terms of design and functionality. It basically indexes songs and artists using last.fm and streams from Youtube. Anyone can download the script and build their own custom “MusikWave”.
MusikWeave is a trade-free project/service, except whatever Youtube (google) may collect about users (something we cannot control). The registration/login is only “required” if people want to save their favorite music in personal folders and access them from any device, from anywhere. Alternatively anyone can save their favorite music in playlists that are memorized in the browser’s cache. But if that cache is deleted then the playlist is lost.
Although musikwave wants nothing from the users, the fact that it uses youtube + lastfm to index and stream, it means these wbeistes inject trackers and ads into the website. Which is hard to avoid….
Since google may collect data about me when using musikwave, then I do not see it as “completely” trade-free, but it is not the website’s fault for that matter.