The tool itself only looks up the information that is already stored publicly on the blockchain. Technically, these are all transactions that have already been accumulated on the produced blocks.
I'm no lawyer, but I know that all Blockchains did indeed trigger privacy concerns all over, which is still an ongoing thing (This is not specific to Hive.) And currently, it's widely accepted that whoever uses any Blockchain, already consented such transactions to be public, and can be publicly used.
So again, I understand your concern, and I appreciate your input. But that's something all the Blockchain tech have to look into, and deal with.