The reasons can be diverse, but the four most common ones are:
1. Errors in document preparation.
2. Incomplete data, brief and unconvincing answers, lack of logic and structure in responses, and the absence of a well-thought-out company history.
3. The nationality of the founders and/or directors.
4. The company's activities or insufficient turnover. For example, it can be challenging for cryptocurrency companies to open an account due to the nature of their business, and many banks evaluate the potential turnover of the company during the selection process.