Exact same problem, for us I counted 15000+ different users living at the same address: House number 43, Gray Colony and Bellevue.
If anyone has IP’s to block or any sort of solution please chime in, we are getting hundreds of abandoned checkouts every day.
I did find this: Reddit - The heart of the internet
Then create a new flow.
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Trigger “Customer Created”
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Conditions: “Customer Address (Address1, Address2, City, State(Province), Zip)”
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Delete Customer