Though STIR/SHAKEN is now common on the IP networks of large phone companies, carriers with 100,000 or fewer customers still have until June 30, 2023, to deploy

Though STIR/SHAKEN is now common on the IP networks of large phone companies, carriers with 100,000 or fewer customers still have until June 30, 2023, to deploy the technology. So... the major carrier already have this, and its still making no difference? Is this rule going to fix the situation when applied to smaller entities or not? The entire situation is such an utter failure of the FCC. Literally millions of people can no longer answer their phone, and its been this way for years.