Because this specific V9r21 release is often used as an offline bundle, it bypasses the need for an active internet connection during every instantiation.
The V9 bundle was a significant milestone because it introduced for Waves plugins and removed the need for an iLok hardware dongle. waves-wvs-all-plugins-bundle-v9r21-r2r-64-bit-osx
Before attempting to use this legacy bundle, consider these modern limitations: How to Install Waves Plugins on Your Mac & Add to Logic Pro Because this specific V9r21 release is often used