I'm baffled that telcos allow this, regardless of regulations.

I get so many robocalls, I stopped answering my phone. But when I get a FaceTime call or an iMessage, I'm on it.

Robocalls dilute the trust consumers have in the phone system. The telcos are rapidly ceding this trust to other forms of communication -- those provided Apple, Google, Amazon, Facebook etc. As robocalls proliferate, tech companies win and telcos lose. Unless they fix this, eventually the phone system might go away entirely. Consumers -- especially young people -- won't want or need it.