First, licensing: national government bodies and international institutions grant banking licenses and regulate the sector. Being under pressure from international organizations like FATF from OECD, they install national anti – money laundering legislation and implement it, governments upgrade the resources of financial regulators and reporting procedures for suspicious transactions.
In the last decade, governments found out that their licensing power allows them to raise tax revenue and to receive useful information to control interest rates and economic activities.
The theoretical setup of national regulators follows democratic principles (separation of legislation, execution, and jurisdiction), but de facto they can exercise a power that can only be found in dictatorships. Regulators can issue penalties not only for assistance in money laundering, but also for non-compliance and for lack of checks. If a regulator decides to freeze the funds and appoint a “competent person” to control the affairs of a bank, large audit firms can enjoy a “free lunch” to charge fees which are secured by the frozen assets.
So, management of banks is under pressure and forced to avoid risk.
Second, there is no obligation to contract: although a bank account is a necessary infrastructure for companies as well for private persons, most governments do not impose an obligation to contract on licensed institutions. Such an obligation to contract is usual for other suppliers of infrastructure (e.g. electricity, water, telecom), they are obliged to enter into a contract with every person or company who is willing to accept the general conditions and to pay the fees.
Third, banks have different risk appetite that also varies over time, depending mainly on their current portfolio and actual cases. Also, they have different approaches to evaluate risk, especially the risk of industries, of countries, of companies with non-resident management and of non-resident companies.
Fourth, international payment transactions happen via correspondent banks that are as well regulated. Therefore, banks must look out for several correspondent banks and consider their risk appetite.
Fifth, banks like clients who need loans or purchase asset management, while company bank accounts with liquid cash are not generating much profit for them. The market gives the banks the option to choose among the demand.
However, while all institutions look out for similar “ideal clients”, this market is competitive, but banks still need to generate profit. Some specialize on niche markets and accept certain groups of clients against higher fees that are seen as high risk by other banks.