Why was ECDSA chosen over Schnorr Signatures in the inital design?

Why was ECDSA chosen over Schnorr Signatures in the inital design?

Schnorr Signatures and Signature aggregation is in the bitcoin technology roadmap. Schnorr Signatures was around the same time ECDSA is around.

Why wasnt Schnorr Signature Scheme implemented at the get-go instead? Why was ECDSA chosen over Schnorr Signatures in the inital design?

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