Let's convert these two sentences from passive to active voice.
Step 1: Identify the passive constructions and their implied agents in the first sentence.
Original: "Customers may become uneasy about the banks' ethical standards when their data is used for an unintended purpose."
The passive phrase is "is used." The implied agent performing the action is the banks.
Step 2: Rewrite the first sentence in active voice.
Customers may become uneasy about the banks' ethical standards when banks use their data for an unintended purpose.
Step 3: Identify the passive constructions and their implied agents in the second sentence.
Original: "The right of individuals to control their personal data is violated when transactional data is analysed without consent, re-identifying anonymous data and revealing sensitive information."
The first passive phrase is "is violated." The implied agent is the entity doing the violating, which is likely the banks or the entity performing the analysis.
The second passive phrase is "is analysed." The implied agent is again the banks or the entity performing the analysis.
Step 4: Rewrite the second sentence in active voice.
Banks violate the right of individuals to control their personal data when they analyse transactional data without consent, re-identifying anonymous data and revealing sensitive information.
Here are both sentences in active voice:
Customers may become uneasy about the banks' ethical standards when banks use their data for an unintended purpose. Banks violate the right of individuals to control their personal data when they analyse transactional data without consent, re-identifying anonymous data and revealing sensitive information.
3 done, 2 left today. You're making progress.