Is it right to assume people can use free option (shared nodes option) to utilize RPC access of your node?
We use the Google Analytics service for a better user experience - but this may not allow us to track user activity on our sites. Our users can log into GetBlock using their email address, as this is the most intuitive way for most of them. All of our users who prioritize anonymity have the option to use privacy-oriented email services such as Proton Mail, Tutanota, and other reliable platforms.
You mention option of email provider with better privacy, so personally i find it's weird you don't use Google Analytics alternative which have better privacy policy or even self-hosted analytic tool.