So... de-facto mass deanonymisation of all Spanish social media users? I see a lot of supporters of these policies either not acknowledge that you can't identify under-16yo without identifying over-16yos.
Meaning: these websites simply need to request 2 pieces of data: a boolean stating whether you are older than 16 or younger, and a UUID. Zero other pieces of identifying information. Where does the mass deanonymisation enter into this? What does it even mean in the context of using algorithmic social media whose entire business model is surveillance of its users?