Discord also calculates a whole lot of (inferred) demographic information. Estimated age, gender, and surely much more. They also feed all the messages into a ML model, which guesses what people are talking about, and pushes a notification to other users. This is probably the culmination of all that, this is why they refuse to be e2e like every other reasonable messaging app...
direwolf20|19 days ago
prussia|16 days ago