[cjblomqvist]

By not storing that type of data. It's you need to store that type of data you can also anonymize or turn into keys where you keep the answers in a separate (mutable) database.

Also, for some purposes (legal) you are allowed to store the data regardless because you have to for other reasons.

[kakarot]

But what about successors of GDPR? What if it becomes illegal to harbor certain information that already exists in the ledger?