GDPR law requires multiple conditions:

* Getting customers consent to collection of their data in your store.

* Specifying how and when this information is used in your privacy policy and cookie policy.

* Having the ability to delete data when requested.

* ...

Having a cookie consent bar is one of the first steps you need to take in your compliance efforts. The app ensures you're acquiring customers consent to collection of their data in your store.

Read more about GDPR here.

We highly recommend consulting with a lawyer to ensure your store is GDPR compliant.

Read more about needed steps in Shopify's help documents.