[openstreetmap/openstreetmap-website] Limit user registration with the same email address (Issue #3978)

[Tom Hughes]

As @pnorman says this is like putting your finger in a dyke and ignoring the open floodgate beside you.

If somebody wants to create extra accounts there are endless ways to get an email address so making one very slightly harder is going to achieve nothing. At least if they use plus addresses we can tell that it's definitely the same person - if they start signing up with throwaway accounts with other services then we can't definitively link them.

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