It's coming to SMS and probably other "chat systems" too. It's quite easy to build a robocall system on top of Twilio now and they offer much more than just calls.
I wish people built their robocall systems on top of twilio. Twilio doesn't let you spoof willynilly, and responds to abuse reports
I have my own frustrations with Twilio but one cool feature is to just flat Reject a call. I porteted numbers I needed into Twilio and made a greylist app. You can rotate numbers in/out to de-spam them (a bit)