The only reason why your workaround isn't blocked as well is because it has additional steps that don't explicitly breach Mozilla's policies. But it certainly defeats the spirit of it.

For instance, a strict interpretation of the law would require publishers to get opt-in consent by individual vendor, rather than an 'Accept All' pop-up prompt. The approach that publishers and ad tech vendor are taking is that a mass opt-in button - with an option to dive deeper and toggle consent by vendor - follows the "spirit of the law". This stance is increasingly coming under fire, though, especially as seen by a new study by researchers at UCL, MIT, and Aarhus University.