The solution is accessible law, not better anti-fraud tooling. Introduce a spam / fraud button, using it requires your pin and costs $10, but obliges your telecom provider to record the call (preferably including a few minutes before you hit the button), email you a signed recording and if found to be spam deposit $100 onto your account. Your provider may then hand the fee +10% for himself to whatever network the call in question entered his own network from. The last cooperative network in the chain gets stuck with the fee, forcing them to either reclaim the money from the malicious customer, the next network in the chain (in court) or pony up the money themselves.

Result: All routes to non-cooperating networks get dropped within days to weeks and scam-calling stops being a lucrative business basically instantly.

That's pretty much the proposal I've made for some years.[1]

California has introduced bonding to telemarketing firms specifically. I feel that should apply at the carrier level, where networks carry a guaranteed bond, pay regular premiums on it, and are dinged for unwanted calls, with the proceeds being split among the called party and any third-party network(s) traversed by the calls. Downstream networks could seek compensation from ANY upstream network carrying the traffic regardless of whether or not they originated it.

This would both create a penalty for providing, or transiting, unsolicited calls, AND create an incentive for carriers / network providers themselves to pursue unsolicited traffic from their peers.

<https://oag.ca.gov/consumers/general/telreg>

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Notes:

1. See for example <https://toot.cat/@dredmorbius/111099306069523624>

I think we have to do something this extreme. We have to give the system a total makeover. Somehow we also have to keep it from being fully centralized and have the big brother problem on the other side. Unfortunately these two goals are difficult to get through at the same time, with the system that we have.

Infeasible. Fraud or spam is usually pretty hard to confirm from one recording without additional context. Many scammers have plausible deniability or are just checking whether the number is active. Moreover, this solution would involve secret non-consensual recording; what if it's not a scam?

How are they listening to a few minutes before the button? A "temporary" recording of the first 2 minutes of every call? I feel like there would be some privacy concerns.

A lot of scams unfortunately operate right on the line of legality like the car warranty morons

Simpler yet: require every call to come with a physical source address, huge (and enforced) jail times for faking it. Let the internet and the pissed callees crowdsource the rest

I spent a little time unsuccessfully looking for a reference, but in some ancient Greek and early Roman governments, newly elected officials who were in charge of money were required to personally indemnify (become responsible for the professional liabilities of) their predecessor.

If your predecessor committed fraud, you were 100% personally responsible for it. You would then gather the evidence and sue your predecessor for your losses.

I don’t understand how this works. Suppose someone calls you about some political poll and you hit the button, would it count or not? What about a cold email (there was another such thread about cold emails being praised, i said fundamentally is spam but was downvoted lol).