@moirearty Yer there would need to be a huge amount of work put in to let third party ML tools have the same level of user data access as the on device Siri will have without exposing user-privacy issues and whatever api they provide they would then also be legally required to support. If apple fine out they have a sec issue with the API they provide and to fix it break the api for existing third parties they could face legal action as they are breaking competitors apps (unfair advantage..).