I couldn't see how this paper proves that no TIN is required, but reading it led me to think that there must be on-line resources to verify TINs, and indeed I found this one within a couple of minutes. It needs basic registration and you get five free shots. I could check my wife's as well as my own PIN numbers and they checked just fine.
So each country deploys it's own Web Service and all countries use a common WSDL (Web Service Definition Language), we used to say "weezdle", in our IT jargon. The documentation of the of the Thai service is here. The Tin Check application above just calls the relevant services based on country code, it passes the number and receives the status.
So lets be careful with assumptions that RD won't be able to corner us, the more I look into it the more I see that work has been done.