What are two typical reasons why customers CANNOT move their database into the public cloud?

Customers may not move databases to the public cloud due to "Putting data in the cloud would break data residency rules" (A), where laws mandate data remain in specific regions, and "Regulations that prevent moving data into the public cloud" (B), such as industry-specific compliance requirements (e.g., GDPR, HIPAA). "Total Cost of Ownership in public cloud is higher" (C) is a consideration but not a universal barrier, and "Public cloud does not provide storage for more than 10TB" (D) is false, as OCI offers vast storage options. Oracle’s cloud adoption guides cite residency and regulatory constraints as common blockers.