When Twilio gets a $100k fine for abuse of the $1/mo number, they'll govern the behavior of their customer better and probably eliminate 80% of the bad actors in hours. You could also modify the regulation of interstate carriers to make it expensive to spam entire exchanges with junk calls, or even require licensing to utilize the PSTN. (Which allows you to punish licensees for bad behavior.)
These are all solvable problems, big companies respond quickly to sticks and over time to carrots.
When Twilio gets a $100k fine for abuse of the $1/mo number, they'll govern the behavior of their customer better and probably eliminate 80% of the bad actors in hours. You could also modify the regulation of interstate carriers to make it expensive to spam entire exchanges with junk calls, or even require licensing to utilize the PSTN. (Which allows you to punish licensees for bad behavior.)
These are all solvable problems, big companies respond quickly to sticks and over time to carrots.