There are different ways to look at it. For me, I would define financial pollution that equates to a system being heavily corrupted by bankers, policy makers, regulators, politicians who manipulate the system for their own gain.
Yes, the corruption you mention is absolutely true.
The precise method of appropriating wealth from the rest of society is a partnership between the political and financial elites. The politicians and banks both issue paper financial assets while there is trust in them, mainly to gain "free" power and wealth personally, and the toxic effects of this issuance, in the form of long-term inflation and financial instability, is left for the economy at large to deal with.
In this partnership, the state provides the power, while bankers provide ideas. The financial assets issued by banks are built on top of those issued by the state (money and public debt), so the bank assets form a layer of protection for the state assets (when bank assets crash, state assets actually go up in value in most cases -- the state can also choose to bail out or abandon the banks.) This is the benefit the banks give to the political class in return for a share of the loot, in the form of some degree of public guarantee of their debt, lax regulation, etc.
The central bank is the corner stone of this system. Its function is to keep both sides "honest" under the terms of the partnership. If the state goes wild with issuing public debt, for example, the central bank can refuse to print money to bail it out. If a bank similarly acts out, the central bank can regulate it or refuse credit.
The key, though, is issuing financial assets and artificially propping them up with state power.