Rejected applications to open accounts, blocked accounts, and limited transactions are directly related to confirmation of sources of income, including those that are periodic (for example, dividends) or subject to independent appraisal.
The bank must see the entire chain of the flow of money into assets and back again when they are sold, including the funds used to purchase the assets, or an explanation of payment sources or sources' increased value. It is generally difficult to prove the legitimacy of payments, the chain of acquisitions, or value without restoring the chain of ownership and obtaining the expert opinion of appraisers.
Not all clients of banks are willing to adopt this approach, since it requires a lot of time to study the problem in detail.