There's no difference between "central" money and other money, though. It's all just money.
> Do we have rules that forbid specific industries from contracting loans?
Regulations differ by jurisdiction, but generally you can't do any kind of banking business without being licensed specifically as a bank. For example, if you get a car loan "from the dealership" it's not actually the dealership giving you the loan, but a bank that they partner with.
You misunderstood my question. I was asking, are there industries, say Oil or Porn, who are by law or regulation forbidden to borrow money from any bank?
There's no difference between "central" money and other money, though. It's all just money.
> Do we have rules that forbid specific industries from contracting loans?
Regulations differ by jurisdiction, but generally you can't do any kind of banking business without being licensed specifically as a bank. For example, if you get a car loan "from the dealership" it's not actually the dealership giving you the loan, but a bank that they partner with.