Scammers already will spend multiple days on a scam call. Watch some Kitboga videos, he'll strings them along for a week.
"Google will call you again tomorrow to get you your refund."
There, we've successfully circumvented all of Google's security engineering on this "feature."
This is obvious to anyone with a brain. I'm not familiar with scam logistics or the videos you mentioned, and the exact same line you put in quotes is what first came to my mind.
tl;dr of this post is that Google wants to lock down Android and be its gatekeeper. Every other point of discussion is just a distraction.
Check out this A&E Intervention episode for Greg. They have continuously worked this guy over for months.
https://youtu.be/YIR-nJv_-VA?t=121
They don't mind being patient when they have dozens of other victims in the wait queue.