I've thought about something similar for spam calls: I can play whack-a-mole blocking individual numbers, but it won't scale fast enough and scammers will always get to me. I can rely on iphone's "scam likely" notification and just not answer those, which helps.
If the latter (and whatever similar feature android has) were somehow perfect, scammers would have a bad time. But.. if they convinced (paid) some (more-)legitimate companies to have their outgoing calls show up as the same number as the scammers use, people would eventually learn that they have to pick up scam calls or else miss calls from their bank/pharmacy/whatever.
> if they convinced (paid) some (more-)legitimate companies to have their outgoing calls show up as the same number as the scammers use
In the US the STIR/SHAKEN[1] protocol adds source-verification. If/when this finally gets fully rolled out, spoofing caller ID without it being blocked is going to get much harder.
But, I'm sure the next step for them is to just go after the millions of small-medium business IP telephony systems that are either poorly configured with default/guessable passwords, or have wide-open security holes.
If the latter (and whatever similar feature android has) were somehow perfect, scammers would have a bad time. But.. if they convinced (paid) some (more-)legitimate companies to have their outgoing calls show up as the same number as the scammers use, people would eventually learn that they have to pick up scam calls or else miss calls from their bank/pharmacy/whatever.