Does anyone know why 1Password's client application is closed-source? For a company so "modern" and insistent on transparency, it seems weird that they wouldn't

Does anyone know why 1Password's client application is closed-source? For a company so "modern" and insistent on transparency, it seems weird that they wouldn't even release the client app code as at least "source available". Don't get what they would be losing here. Same question with the server. Bitwarden seems to be doing just fine with an open-source/source-available approach.