I principle, I like the idea....and as I do not play credit games, it does/would not impact me.
But WGT/TG will never do this as it will reduce the number of players entering RG's and/or challenges, thus reducing their revenue.
It will not necessarily reduce multi accounters as if they want to create false ID's it is remarkably easy to do so......and IP's can easily be masked.
Not all players trust WGT for various reasons and will not share information with a company that has not earned the trust of many players.
To put it into context, WGT care only about revenue - hence why the largely unpopular clashes and other unsavory sales tactics continue.......they will not do anything that may reduce this revenue stream - like I said, I agree with the Idea AB,,,,but sadly it will not happen.