[latexr]

> just having to find voice clips of the person

You can clone a voice from a clip which is under 5 seconds.

https://www.pcmag.com/news/microsofts-ai-program-can-clone-y...

All you need is a short spam call and you’re done before you even realise anything is happening. Or grab some video out of Facebook since you’ll have the family connections right there for the taking.

[Ukv]

There's no human in the process (to be trawling through Facebook pages looking for videos where relatives speak) prior to the victim picking up - and even then often not until the victim has replied to some initial hook. The huge number of phones being automatically rang doesn't permit it, as far as I can tell.