Marxist Germany wrote:1. Adolescents are not defined as minors in this proposal, they are users.
According to 1b anyone under the age of majority is a minor, and 1e specifically states that these adolescents are minors. 2a therefore applies to them. They can't have a login that requires a website to hold data personal such as an email address without the consent of a guardian.
2. Use a warrant
You can't. WA law trumps national law and your proposal forbids the police from accessing that data. That can't be countermanded by a local warrant.