The law doesn't care all that much about logistics, for one. More importantly a license like this only practically matters for published work, and published wor

The law doesn't care all that much about logistics, for one. More importantly a license like this only practically matters for published work, and published work is generally not completely anonymous; WOTC doesn't know everyone who has published something under the OGL but they certainly know of Paizo, Roll20, Critical Role, etc. and fundamentally those are the ones they care about. If Jim your local DM keeps writing homebrew they won't know, but it's also not who they're aiming at (yet).