ID.net is just a simple verification method like how you verify your account through email, ID.net logins was common back in old flash games that ran in your web browser. But a lot of people stopped using it because it became unsafe, almost insanely easy to hack into, so email is more commonly used since it's safer, More reliable. And overall more secure. Though the real question is why on earth doesn't graal have a method to change emails. That's considered a most have for almost any email verifying application