If someone is in a country where you have to register yourself how do you circumvent that?
Guess it depends on what kind of number.
That said, for any interesting kind of number I can think of, I can see some legit use-cases, but I can also see a lot more non-legit use-cases...
PII - personally identifiable information
Guess it depends on what kind of number.
That said, for any interesting kind of number I can think of, I can see some legit use-cases, but I can also see a lot more non-legit use-cases...