It's also a huge gift to the very surveillance capitalists they're pretending to protect children from. It de-anonymizes everyone, including children, and with the first exploit and dump of of the database (which will absolutely happen), all those children's real identities will be known to every predator in the world in addition to the social media companies who've already shown they can't be trusted with personal data or the ability to track people across the internet.

It is a catastrophically dangerous idea, and it's exactly what the abusive social media companies want.