An important aspect here is the fact that subpoenaes only share information one way. You are asked to provide information, and you get zero information about wh

An important aspect here is the fact that subpoenaes only share information one way. You are asked to provide information, and you get zero information about why. There is a simpler way to get information: Contact the person you want information from and make the case that they should give you the information. Using a subpoenae seems like something a government would do when they're doing something shady and don't want you to know about it.