Yeah, generally you have to have some sort of superficial "I agree" and usually in software licenses using the software is a "de-facto" agreement (with court support, at least under US Law). So if you create something under One D&D's OGL you are de-facto agreeing that anything you made under 1.0 or 1.0A has been replaced with 1.1. This means that if, say, Paizo published ONE adventure for One D&D under OGL 1.1 then they just handed ALL of Pathfinder and Starfinder over to Wizards with a perpetual, irrevocable license to do whatever they want. Hence, the "Gotcha." Wizards could, in turn, post a 30-day notice revoking all usage on their website and still reprint anything Paizo made consequence and repercussion free. Although that might get a little tricky with trademark law and it's still a bit of a mess but in theory it could happen.This seems plausible enough in the abstract - ie that a condition of taking up rights in a revised SRD under a new licence is waiving whatever rights one might have enjoyed under an old licence.