As stated in the post, it's a simple solution to help with anonymity.
"The password has been hashed client side and just the first 5 characters passed to the API As mentioned earlier, there are 475 hashes beginning with "21BD1", but only 1 which matches the remainder of the hash for "P@ssw0rd" and that record indicates that the password has previously been seen 47,205 times."
"The password has been hashed client side and just the first 5 characters passed to the API As mentioned earlier, there are 475 hashes beginning with "21BD1", but only 1 which matches the remainder of the hash for "P@ssw0rd" and that record indicates that the password has previously been seen 47,205 times."