I honestly don't care who this guy is. A centralised server providing this service is a problem. It's not like he is using some magic decentralised thing to run queries so we have mathematical proof nobody can aggregate data. No, it's a server he alone has root running whatever software.

The notion itself of revealing info about you to a 3rd party in order to verify that more info hasn't been leaked seems... conflictual at some level.

Your account presumably isn't new. Are you any braver?