Stop Siri from responding to all speakers.

Siri on my iPhone responds to only my voice, or to only those with very similar voice; I've actually only known one other person that caused my siri to respond consistently. My iPad, on the other hand, responds to anyone. Regardless of supposedly correct responses given on similar questions; Siri has not and on some devices still does not always respond to anyone to say "hey siri" or "siri". Further, especially for phones; if Siri were to respond to all voices, in public spaces this would be immensely problematic, ultimately rendering the feature unusable. It makes some sense that Siri would respond to any voice in a home setting, but there certainly ought to be a setting limiting this behavior, just as my phone is, in absolute irrefutable fact, capable of not responding to every voice it hears. So what is the real answer to the question of how to get Siri to not respond to all voices. Do not tell me that all devices except home pod respond to all voices the same way, IT IS NOT TRUE.