Ha! The Discord GDPR/Data Export thing reveals that it's running models to figure out what gender you are. If you go to /activity/analytics/events-*.json and grep for predicted_gender you get something like:

{ "user_id": "282657081457115136", "predicted_gender": "male", "probability": 0.8413839340209961, "prob_male": 0.8413839340209961, "prob_female": 0.11650349199771881, "prob_non_binary_gender_expansive": 0.04211260750889778, "model_version": "2024-05-08T00:00:00.000000Z", "day_pt": "2024-05-15 00:00:00 UTC" }

Anyway, they seem to have this datapoint _over time_! Meaning you can make a graph of how male/female/NB you are according to discord, here is mine:

It also seems that the same archive has a guess at how old you are too, Discord has gotten this entirely wrong, except one time.

{ "user_id": "282657081457115136", "predicted_age": "35+", "probability": 0.7547529339790344, "prob_13_17": 0.0005852651665918529, "prob_18_24": 0.014580278657376766, "prob_25_34": 0.23008151352405548, "prob_35_over": 0.7547529339790344, "model_version": "2024-03-20T00:00:00.000000Z", "day_pt": "2024-03-27 00:00:00 UTC" }

@benjojo hmm, this feels like very dangerous territory to step on. This might either open them up to inquiries like "how dare you show NSFW content to users you predict as being 13-17", or cause many misclassified adult users to be unable to see such content.
@miki @benjojo Instagram had to answer this exact question about content it flagged as potentially CSAM.