Google says: To comply with European laws you need self-hosted GDC, not GCP
cloud.google.com
cloud.google.com
> Google designed GDC Hosted to meet the most stringent accreditation requirements, including: NIST SP 800-53-FedRAMP High security controls, ICD 503/703, FedRAMP+ for IL6 authorization, and FIPS140-2L3, as well as a range of European requirements–both existing and emerging–with the evolution of the EU Open Strategic Autonomy initiative.
Meaning that anything they published so far, about GCP being GDPR-compliant, was of questionable value.
Beyond marketing from being affiliated with Google, the hosted GDC brings little value, it appears.
Moreover, going with GDC feels like a huge business continuity risk.