Oh… so you are calling a database a “block chain”.
Do you have another definition?
Colloquially, it often refers to a consensus algorithm paired with a chain of blocks.
Bitcoin’s innovation wasn’t a blockchain, it was a proof-of-work backed consensus algorithm that allowed a group of adversarial peers to agree on the state of a shared blockchain datastructure.
The distinction here might be with a decentralized network.
Which can change.
There also is centralized proof-of-work blockchains. Clouds were offering them awhile back and IBM had some offering.
What is colloquially even susposed to mean here? That the common usage doesn't match the definition? Maybe definitions change over time....