What data are you collecting on me?
On the account side, it's just what's necessary to facilitate your account, and all of that is stored in Auth0.
New Relic is installed to be able to help debug the app's performance and any errors it may generate. This is both on the backend and the client side.
The site doesn't collect any personally identifiable information in the analytics (though your email address will be visible to the site owners when you sign up for an account). Please feel free to sign up with an email alias - I personally recommend Fastmail's aliases, Simplelogin, and Apple's "Hide my Email" feature are alternative options. You do generally want it to be available since the game invite system relies on sending an email (or having your friend send you a link).