Because their personal information is monitored without their agreement, bank customers lose their right to privacy. change the passive voice into correct format

The passive clause is "their personal information is monitored without their agreement." The agent performing the monitoring is not explicitly stated, but it can be inferred from the context of "bank customers."

The implied agent doing the monitoring is likely the banks or financial institutions.

Changing the passive clause to active voice:
"Because banks monitor their personal information without their agreement, bank customers lose their right to privacy."