It covers more than that, but it's not strictly mandatory.

> Content Filters: Discord users will need to be age-assured as adults in order to unblur sensitive content or turn off the setting.

> Age-gated Spaces – Only users who are age-assured as adults will be able to access age-restricted channels, servers, and app commands.

> Message Request Inbox: Direct messages from people a user may not know are routed to a separate inbox by default, and access to modify this setting is limited to age-assured adult users.

> Friend Request Alerts: People will receive warning prompts for friend requests from users they may not know.

> Stage Restrictions: Only age-assured adults may speak on stage in servers.

What gets deemed “adult” is incredibly random as far as I can tell, some of our servers/messages have triggered it, but no porn or anything is shared in them.