Is ACF GDPR compliance?

Same here

We have some answers on this page https://www.blogmojo.de/wordpress-plugins-dsgvo/

This is such a broad question.

Just installing ACF isn’t going to affect your GDPR compliance, but creating a form inside ACF that stores user data will *not* be GDPR compliant by default unless you fulfill all the obligations under GDPR (Deletion, data portability ( might be covered by standard functions WordPress provides, depending on how you store the data.))