I don't know but he's making it a more valuable resource. He is letting the spammers charge more for his number when they resell it since it's verified.
Hell, I was looking at the spam filter on Messages and accidentally opened one. It was sent as an RCS message and I was worried I'd be flagged and spammed more because of the Read receipt.
You should also forward each message to spam@uspis.gov (yes, you can text to email addresses) if you want to help take down the scam sites and get the numbers blocked.