Screenshot from Discord's FAQ: How does the age inference model work? We leverage an advanced machine learning model developed at Discord to predict whether a user falls into a particular age group based on patterns of user behavior and several other signals associated with their account on Discord. We only use these signals to assign users to an age group when our confidence level is high; when it isn't, users go through our standard age assurance flow to confirm their age. We do not use your message content in the age estimation model.

Photo from the 1979 IBM training manual: A COMPUTER CAN NEVER BE HELD ACCOUNTABLE THEREFORE A COMPUTER MUST NEVER MAKE A MANAGEMENT DECISION