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Cookies or browser fingerprinting should do the trick, with gentle reminders to register. It's how most online shopping carts work.

I'm not saying no one should ever use OAuth2, ever. Sometimes websites have to jump through weird hoops to get conversions. But as a web developer, it annoys me a lot.

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Cookies and fingerprinting tell me that the same browser is coming back to my website, but I don't care about the browser I care about the user. As a user if I go to a website on my work machine, my home machine, and my phone then I'd like my data to be available on each.

I don't have strong opinions on OAuth or any other federated identity solution, I just think it's a specious claim to say that just because a system doesn't care about who a user is then that system doesn't care about the uniqueness of that user.

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