Call screening can be defeated by falsifying the Caller ID. Already widely done. The only added step needed is to identify each phone's white list. With a cooperative network of thousands of random callers this can be built by brute force methods pretty easily. I suspect this is also happening. A limited form already is as the false Caller ID is often chosen from a list of local numbers.
It is sometimes hard to realize the total magnitude of the effort that goes into these scamming operations. To think that the Amazon/Google AI will be up to the task seems overoptimistic. It also seems the wrong way to attack the problem. An ongoing technology war which means an ever increasing investment in the defensive end of this isn't a real win for us.
We need to look for analogies to the trap door functions used in cryptology. Something which is really easy on our side, that make immense extra effort on the other side.
I guess it is similar to other on going battles.
Good vs evil.
Police vs Robbers
Anti-Virus software vs Malware creators
Bacteria vs Antibiotics/Antibacterials and other advances in medicine
In my case, I only currently, get such phone calls, very infrequently. But if that changes, it might press me to take action.
My phone(s), have options I can enable, which pre-screen phone calls (if the caller is not recognized as "friendly/known") , which I enable, if I have a spout/burst of SPAM phone callers.
Sometimes they start to phone every week, or every other day, and it begins to get very annoying.
I still wish that the Police, Governments (hence agencies which can fine the companies. But the fines are way, way too small at the moment. Give them teeth!
), phone companies, Telephone manufacturers, and Electronic gadget device designers/manufacturers would get their acts together and solve/minimize this problem.
Although the "Electronic gadget devices" solution, would land, potentially in my court and/or other users of this forum. So, I have to take/accept some of the responsibility for this issue not being dealt with better.
I.e. In theory I/we could design something to help out, which screens (removes the SPAM) calls for everyone.