>when the French regulator mandated the telcos to implement a complete block of spoofed phone numbers (it's not an actual hard block, but unauthenticated calls will be market as "private number" which are ignored by most people already).

This is good but not far enough. They should not show up as "private number" they should simply now show up at all. After some time, any networks that even allow spoofed outgoing calls should be disconnected from the phone system.