The way it’s imposed on the fediverse is bad, but I like this part:

The Blueprint is open source and uses zero-knowledge proofs: cryptographic methods that prove a statement like “over 15” without revealing the underlying data. Each member state must provide at least one such solution free of charge to its citizens.

This means that age verification can be technically integrated before account creation. It becomes more difficult afterward when the KIDS Act encounters the architecture of the ActivityPub protocol.