These are web-based applications (no software installation required) that claim to extract audio from a Spotify link and save it as a high-quality MP3 file. The term is marketing hype, suggesting:

Security researchers consistently find that “exclusive” converters bundle spyware, ad-clickers, or cryptominers. Simply visiting the site can trigger automatic downloads of malicious .exe files disguised as codecs.

A typical "exclusive" downloader asks you to: