PERMANENTLY turn off Siri on ALL devices

How do I PERMANENTLY turn off Siri on ALL devices including Apple HomePods, HomePod minis, Apple TVs, Apple watches, Apple AirPods, Apple iPhones, Apple Macs, Apple MacBooks? I have 2 dozen devices, most running xOS 26.3, with an IPhone 16 ProMax I’ve disabled Siri on 3 iPhones but I want to obliterate all traces of Siri everywhere.

[Edited by Moderator]