Few reasons: - nothing public should be closed source, just think about electronic IDs, most of them here in EU are ISO 14443 smart cards BUT with proprietary

Few reasons: - nothing public should be closed source, just think about electronic IDs, most of them here in EU are ISO 14443 smart cards BUT with proprietary middlewires, what if a day one of their OEMs cease to exists and so no one else support it's middlewires? - infra can't be designed up-front well, countless of integrations might be needed, it's not just a matter of open protocols, for instance a State might develop an SSO for the public sector, anyone can run an instance of a federated services and integrate it in their own infra stack