One way to replace it, would be that when you sign up, you provide email. The website sends you a private link. And you always use that link to log into the w

One way to replace it, would be that when you sign up, you provide email. The website sends you a private link. And you always use that link to log into the website. Instead of typing in the address into your browser, you'd type it into your email client and get that link, and click on it.