Can the bank refuse to give you your money?

Could you elaborate on the scenario where a bank might refuse to provide access to one's funds? Is there a specific set of circumstances under which this could occur? For instance, are there any legal grounds or regulatory frameworks that could justify such an action? Additionally, are there any preventive measures individuals can take to safeguard their access to their money in the banking system? It's important to understand the nuances surrounding this question, especially in the context of cryptocurrency and decentralized finance where traditional banking practices may not apply.