The perpetual/irrevocable switcheroo is the least of the problems with the OGL. As gsllc@chirp.enworld.org - an actual lawyer, as well as a #DiceLawyer - wrote back in 2019, the OGL is a grossly defective instrument that is significantly worse than useless.
https://gsllcblog.com/2019/08/26/part3ogl/
The issue lies with what the OGL actually *licenses*.
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