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It can be very easy, depending on your comfort with breaking existing systems. Disable all inbound international calling and you no longer have a problem. That would remove 99% of spam and would have zero negative impact to 99% of individuals who receive calls.

Of course, businesses with a lot of money care about use cases in that last 1%.

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Can't you disable international calls only for individuals who don't need them?

A carrier could probably do that, individuals could not. The challenge is that caller ID is generally kinda like your email display name: It doesn't mean anything. The important part, which STIR/SHAKEN is adding verification requirements to, is what telcos are actually involved in the exchange.

I'd love a setting I could flip to disable inbound voice calls from any carrier that isn't like... Verizon, AT&T, T-Mobile, and Comcast.

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