Is “Silence unknown callers” released to the public already, under Settings > Phone?

EDIT: The help text says:

Calls from unknown numbers will be silenced, sent to voicemail, and displayed on the Recents list.

Incoming calls will continue to ring from people in your contacts, recent outgoing calls, and Siri Suggestions.

Looks like it, thanks I'll update the top of the article. The basic and disruptive full-screen UI is still the only option for receiving calls

I’d like to see Apple buy Truecaller and then actively keep a database of spam callers.

Here In the UK I’ve lost count of the amount of robocalls that say “We heard you were in an accident”.

In my opinion this is mostly a telco problem. They are the provider of phone calls and infrastructure and should own this for their customers.