According to fullfact.org, You could sign the petition twice using the same email address and as many times as you liked using different email addresses .
You could use any name you wanted and somebody signed using Mrs May and put their address as 10 Downing street.
It was also suggested Donald Duck and Micky Mouse signed.
It’s possible to use the same email address to sign the Revoke Article 50 petition up to two times.
fullfact.org
So in fact they didn't say you could sign the petition repeatedly they said you could sign it only twice
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Conclusion
It’s possible to use the same email address twice but no more than that.
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A House of Commons spokesperson told us “Many people share an email account with a partner or do not have access to email. To ensure that the petitions system is as accessible as possible, up to two people can sign from the same email address. An email address can only be used twice.
“The number of these signatures is strictly monitored to ensure that this feature is not abused. The number of these signatures on the article 50 petition is within the normal range—around 1%.
“The Government Digital Service have a number of ways of identifying and preventing fraudulent activity based around blocking, removing and monitoring signatures as appropriate.
“Some types of fraud are monitored to ensure that it does not affect the integrity of the petition. Evidence of fraud may affect whether the Petitions Committee choose to act on the petition.
“We do not comment in detail on fraud. Ideally someone who has tried to fraudulently sign the petition would never realise that they have failed.”
We verified this by testing the petition system, attempting to sign a petition three times from the same email account using different false names each time. On the first two occasions we were told our signature had been added to the petition, but on the third time the system told us we couldn’t sign again as we’d used that email address before.
We subsequently asked the Petitions Committee to remove our test signatures, which it has now done.
Why are you still pushing this long dead issua,have you nothing else?