There are hundreds, you'd have to play whack-a-mole with myriad VoIP and second- and third-tier wireline providers to get them all. And that presupposes that the accounts are even legitimate. A lot of robocalls are delivered through hacked SIP credentials.

I know people like to pick on them because they do seem to turn a blind eye to all but the most egregious spammers, but Twilio is only the source of a lot of spam calls because they are a large carrier in their own right. It's like all of the people moaning about Californians being the most common place of origin for people moving to their area; that's true, because California has the most number of people.

US Congress authorized FCC to fine robocallers. There are now billions of dollars in such fines racked up. But no way was authorized to enforce collecting on the fines, so nobody pays them.