Just because a call is a spam call doesn't mean it is spoofed. STIR/SHAKEN ends spoofing but anyone can ultimately buy a phone and make calls that are spammy.
From what I’ve investigated as a recipient of spam calls, I’ve been called from legitimate mobile numbers from my own mobile telco. The only thing that explains that are SIM card banks.
Unfortunately there isn’t an easy way to report abuse to the telcos (and regulators).
Sure, but with phone numbers that can't be spoofed, telcos can terminate service, and filtering technologies can block calls. Spam gets expensive if you have to buy new service every five calls.
Preventing spoofing doesn't have to make spam cost-prohibitive for every spammer to greatly reduce the volume, and it does not interfere with ordinary people obtaining phone service anonymously.
