And the fact that it was an informal request, not legal arm-twisting, and that they complied anyway just makes it more evident that there was some form of tit-for-tat expected.
A formal request would cite legal authority.
Interesting, btw, that you assume that Clinton did this directly, despite zero evidence. Seems just as possible to me that a staff member would have made the request.
If there is a threat to you for non-compliance of his request, then he has likely broken the law.
When an email comes from @state.gov with the description of "U.S. Department of State SUBJECT TO AGREEMENT ON SENSITIVE INFORMATION & REDACTIONS." I don't think it can be considered Hillary making a personal request.
Ironically this might have been a very appropriate use of Clinton mail.
I didn't claim Hillary made a personal request. I stated that an informal request was made, whether it be from Hillary herself or a staffer on her behalf. It is still an informal request that a private company can politely or impolitely decline.