I am surprised to see Tracking in Privacy Policy marked “Y” for ProtonVPN. Why do I need to enter my email address on their app? I just need an anonymous conn

I am surprised to see Tracking in Privacy Policy marked “Y” for ProtonVPN. Why do I need to enter my email address on their app? I just need an anonymous connection to their servers. It can be done without email (you pay and get a random ID from them).