Private Voice Assistants on Mobile/Advice how to Privatize mainstream AI.

I am looking for a voice assistant that is as private as could be its a NEED not a want. I am aware of Mycroft who has discontinued service. I am aware of Rhasspy but it seems like a lot to setup and maintain.

I'm more looking for how to privatize something mainstream on mobile to always have it with me, not a standalone at home device. I'm talking Alexa, Siri, Google assistant, ect. For to do lists, reminders, looking up questions on the web. The usual use cases. In what ways can one make their assistant a little more privacy friendly without not using one? Which assistant is best? Thanks.

Edit: I've considered setting one behind VPN, Behind something like Pihole to block Calling Home from said app or device.