Banking apps often block screenshots to protect sensitive financial information and enhance security. Here are the main reasons:

1. Preventing Unauthorised Access: Screenshots can capture sensitive data like account numbers, balances, or transaction details. If a device is lost, stolen, or accessed by malware, these images could be exploited, leading to fraud or unauthorised access to personal data.

2. Reducing Fraud and Misinformation: Screenshots can be manipulated to create fake transaction confirmations or shared to mislead others. Blocking screenshots helps prevent scams where fraudsters use falsified images to deceive users or businesses.

3. Compliance with Security Standards: Many banking apps use Android’s FLAG_SECURE feature or similar ios restrictions to comply with industry regulations, ensuring sensitive data isn’t easily captured or shared. This aligns with requirements to safeguard financial and personal information.

4. Mitigating Malware Risks: Untrusted apps could secretly capture screenshots to steal data. By disabling screenshots, banks reduce the risk of such security risks, especially on devices with compromised security.

5. Protecting User Privacy: Screenshots might accidentally be shared or stored in unsecured locations (e.g., cloud backups or social media), exposing private financial details. Blocking them minimises this risk. 

While these restrictions can be inconvenient, they aim to prioritise security. Some banks allow screenshots through their web interfaces or offer alternatives like PDF exports for sharing transaction details safely. Always check with your bank for approved methods to capture or share financial information.