A theory I have had for a while (when I put on my tinfoil hat) is that all those robocalls are really looking to generate a voice print of the person associated

A theory I have had for a while (when I put on my tinfoil hat) is that all those robocalls are really looking to generate a voice print of the person associated with a number for future nefarious purposes. For example most people will answer and say "hello, hello, anyone there?" Or something to that effect. Or it will go to voicemail which can then capture their voice. Yet another reason I don't answer calls from people I don't know and use a generic computer generated voicemail message.