This synthesizer is built upon an application framework, JUCE, which is made by ROLI, LTD.

The free tier of JUCE (which this software uses) comes with a condition:

ROLI, LTD may track the IP addresses associated with your use of juicysfplugin solely for their internal purposes in providing JUCE.

https://github.com/WeAreROLI/JUCE/blob/master/LICENSE.md  
https://juce.com/juce-5-privacy-policy