It does seem outside the scope of the investigation. Is everyone Trump knows to be investigated for everything they ever did because they know him?
Yes.
The left did the same during the Reagan years. They've done similar to many conservatives for decades. Remember how Scooter Libby was continually "investigated" by some activist lawyer who finally got an indictment through entrapment?
The goal here is to bully and abuse anyone who stands up against the leftist power cabal, with the intent to prevent any threat to their power by making an example of anyone who stands up to them.
“Is everyone Trump knows to be investigated for everything they ever did because they know him?”
Yes, or at least they have to fear it. Innocence will not stop reputations, businesses, and finances from being ruined. We are witnessing a CIA-style isolate/destabilize operation. Wonder who is running it?