It is funny I am coming back to this, but you miss an economy of scale.
IM F2F TU, I have an electronic "IdentCard" that holds all account information in a restricted screen, as well as all public and legal data in various publically accessed or restricted screens.
But recently the players landed on a TL 8 world. So I took the direction of my international travels on this TL planet of ours
Where the players go they either find that they can close transactions with either their IdentCard, by using their IdentCard for a fee or with local currency they got from an exchange point.
Because these people are very much recognized as "from the stars" no bank will deal with them and transactions with individuals can only be safely made when the Legal system allows the transaction to gain enforcement from port authorities who will restrict or even ground a ship until payment is made and the restriction is lifted.
But this is well below the scale of interstellar banking, and that is the "Scale recognition" that is missing in the poster's first statement.
Loans and Scale should be something similar to the following:
- Local banks deal with locals only, or in those situations where port restrictions can be
enforced, or Mega-Corporate/Imperial guarantees are available to the local institution.
Example: So you get Corner Bank and Holding to come to the port where you sit with a starport, Mega-Corp or Imperial official. The bank then consults with the official sitting in to see what safeguards are available.
- If it is the port, then the ship is looking at being unable to lift until it can make good on
the loan by sending for funds form a neighboring system...which can take a very long
time. So Sailor Sam and his crew are stuck on dustball until their draft can be sent
back to the moneybags system and a hireling of StarBank Inc can escort the funds to
the Dustball system
- If it is an Imperial or Mega-Corporate factor, then failure to repay means that factor's
agents...who are likely watching their investments and getting a cut...WILL hunt you
down if you fail to pay.
But this only covers the smallest category of banking.
Any larger and player characters should not be dealing with local banks. They should be dealing with Mega-Corporations, who are not as restricted in hunting down malfeasance, even less restricted than Imperials...
So the grander interstellar banking network is there for larger entities, Companies, Colonies, Dirtside governments(global or balkanized), Counties, Duchies, Subsector Governments, Sectors, etc... This includes departments of the various governments.
So why does this matter?
As we are seeing now. When the grander scales of economic systems fail, they take down even the lower tiers unless there is a large amount of buffering. In the Third Imperium's case, this is a good thing because that buffering largely exist. With the "hands off" method of letting worlds govern themselves, the Imperium is not involved in their financial system unless it is through aid or direct support.
So when Greece fails, or Large banks in the USA fail, only Greece, The USA and their direct trading partners suffer. It does not become systemically hazardous.
So how does this effect the players in your game?(IE: Why should you care?)
1) It means that players will have to find interstellar sources for loans and financial rescue...making life that much harder for them(because, as GM's know...nothing should be easy for players)
2) Remember that Bank guy escorting funds?? Can we say TONS of adventure hooks here?
3) Do you...the GM..want to discourage players form going somewhere? "Economic disaster making it almost certainly unprofitable" anyone??
I can keep giving reasons. But what needs to be considered here is what scale of bank does business with what scale of customer. Because a local bank will not do business with an interstellar customer does not condemn all interstellar banking.
Add to this the other thing you forget. This is not the banking system YOU are familiar with. This is a banking system with different safe guards, like interstellar networks for tracking customers, Imperial guarantees backed up with the likelihood an Imperial Destroyer(or Frigate) will pull you over if you drop debts and run.
And then there are those fun and friendly Skip tracers >
Marc