Since you bring it up, I don't see any reason why anyone else couldn't start their own Set Registry website and use PSA and SGC grades as their criteria. Heck you can include GAI and BVG if you'd like. But exclude CSA, PRO, etc.
As long as you don't advertise which grading companies you use, it should be legal. Similar to Fantasy leagues using MLB statistics. If your site is more user-friendly and doesn't require membership, you should get more hits that the others combined. Plus if a company goes out of business, the Registry will continue.
Eric B
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