It would literally be a day. They pass the legislation and they would stop.
If the rule is that telcos must eat the cost of a scam, they will drag it out in court and the consumer must still prove it.
If the rule is that each robocall that makes it through must be paid by the telcos (take the consumer out of this), then telcos will battle each other to try and insist that the other party is responsible.
At some point they may even come to a consensus and protocol that protects the customer.
I prefer this option.
There may be other options. Just don’t put the burden on the individual customer.
Edit: Even better, allow bounties so that lawyers can start hunting for robocalls that went through.
> If the rule is that each robocall that makes it through must be paid by the telcos (take the consumer out of this), then telcos will battle each other to try and insist that the other party is responsible.
I don't necessarily see these as guaranteed outcomes. You don't see this kind of behavior for banks, which are generally the ones liable for credit card fraud.