It is actually because you can't do anything with the source phone number being tied to an identity if the scammers are freely able to spoof the number that the end networks and users see. Even if every network in the world adopted this it wouldn't matter if caller id isn't fixed so that you can actually see the source number to go ask who it is!
From your link: "The scam-blocking service is based on modern cloud technology, and it’s scalable, and easy to deploy" - I don't think we need another SaaS parasite for this as protocol-level solution like STIR/SHAKEN is a better approach IMO. The problem is that operators are not incentivized to do anything with spam/scam.
As finn. I can verify scam calls are non-existent lately few do occasinally popup, but its like 2000 times better than before. When i learned about this originally, i was shocked like how this is not default?
I don't understand how this isn't the default. I get multiple calls every week, sometimes many per day, from people saying I called them. This has been going on for years... (Portugal)