We do not store data about our customers use of our plugins. Our plugins are server plugins, and the data users add, are stored inside customers servers.
The only data we have, is when a customer contacts us via email for support or a question and the Customer emails provided by Atlassian Marketplace when customers get a license of our plugins.
Thoses emails are used to answer your requests, and, if you agree, to contact you about important changes in plugins.
All thoses Email adresses are stored inside atlassian databases, in a secure manner in order to prevent unauthorized access to them.