Is this purely theoretical? Asking since we don’t wanna encourage making the world worse if there is indeed a clever way to stay safe - has anyone been hassled after reporting to the Finnish Cyber Security Centre?
You can also submit anonymously and/or via secure email: https://www.traficom.fi/en/contact-details/sending-secure-em...
This is what their privacy statement says: “Data breach information, including personal data, can be exchanged confidentially with other authorities relevant to the breach when required or permitted by law. The person who fills out the form is asked if they consent to the transfer of information to another authority."