Tabs to Links requires your explicit permission to operate, enforced by macOS. You will be prompted to allow access at first launch. Later, you can change your mind in System Preferences. Open Security & Privacy, select the Privacy tab, and find Automation settings.
Tabs to Links respects your privacy. The app uses Apple Events solely to get a list of open windows and tabs from Safari. It can see Private Browsing sessions if the windows are open when using Tabs to Links. In all cases, this data does not leave your Mac.
Mac App Store purchases use iTunes Account billing and payment information is never seen by Tabs to Links.
I am personally happy to address any concerns or queries. Please email me.