Something like Github's approach of forcing users to type the name of the repo they wish to delete would seem to be more than sufficient to protect technically disinclined users while still allowing technically aware users to do what they please with their own device.
Scammers aren't going to wait on the phone for a day with your elderly parent.
"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."
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.
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.
Scammers will definitely call back the next day to continue. But it is quite possible that by then the victim has realized, or talked to someone who helped them realize that they are being scammed.
She went to a bank to transfer the scammer money. They told her no. She came back the next day. The police got involved and explained everything to her. Then she came back the next day. After that, she apparently found another location which let her transfer the money.
There's basically zero chance a 24 hour (or any amount of a) cool off period will help these people.
So Google's going to add some nonsense abstraction layer and when this fails to curb the problem after a 24 hour wait, it will be extended more maybe a week, and more information must be collected to release it. We all know how this goes.
24 is just so long.
But also, my expectation is that a scammer is going to just automate the flow here anyways. Cool, you hit the "24 hour" wait period, I'll call you back tomorrow, the next day, or the next day and continue the scam process.
It might stop some less sophisticated spammers for a little bit, but I expect that it'll just be a few tweaks to make it work again.
There will be some proportion of people who mention to their spouse/child/friend about how Google called them to fix their phone, and are saved by that waiting period.
They have infinite time and patience.
