But having all this designed, ordered, packaged and shipped, just so maybe the receiver calls seems way too much effort. How does this scale? I'd see this make sense for targeted attacks, but like this? Wow.
That's for official parts and at lower quantities I presume. Knock off chips are often pennies, especially at scale. When I buy chips for side projects, I often just source them from ebay/alibaba where you can get them for ridiculously cheap prices. [1][2]
> ...it's still orders of magnitude more expensive than email based spam.
Relative to how much they drain from elderly folks retirement accounts, I think it's a logical investment for them given that existing scammer tactics are being made obsolete.
In any case, I just checked Alibaba and found several listings [3][4] that claim ≤50¢ at scale. They look rather professional and you could even brand a logo on them.
1 - https://www.ebay.com/itm/392526892417 (USB - Serial converter, NOT a USB drive IC)
2 - https://www.ebay.com/itm/392540419491 (power bank chip)
3 - https://www.alibaba.com/product-detail/Usb-Drive-Usb-Drive-L...
4 - https://www.alibaba.com/product-detail/Cheap-customized-Logo...