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You can actually just click "Next" on the sign-up screen without having entered any email address at all. It works fine, for now at least.

that's cool. I get the impression they're not really interested in monetising or data mining if all these loopholes exist, and that their platform is supported by those who wish to engage in microtransactions, which do not hinder functionality in any way e.g. pay for privileges. good on them

What's valuable is your interests so that they know what ads to put in your face. Whether or not your email is linked to you is irrelevant -- you can click on ads all the same. This solution doesn't save you from the data mining they do on your usage.

I use an ad blocker so have never seen an ad on Reddit

Still allows them to identify you over the course of several sessions, which allows them to de-anonymize you.

not if your email address and browser sessions contain no personally identifiable information