STIR/SHAKEN up to this point has only been a self-certification that a telecom company has the right to use a number. What the FCC is trying to do is set up a legal obligation for the STIR/SHAKEN header to match a KYC verified identity.

If the FCC implements this, I expect a lot litigation because of the burden and legal liability this would place on telecom and VOIP companies. There are other less burdensome approaches to preventing spam that the FCC has not tried.