I think discord's data has insane value because it has real time reasoning steps much more than any big social media. Obviously you might want to filter out low information messages like "Hello" but model based filtering for signal is already solved more or less.
Discord has lot of very technical channels like the one which solved BB(5) after decades of research.
Agreed. discord has a unique structure with threaded conversations, context carryover, and back and forth reasoning that you don't get from places like twitter or even reddit.
it's especially useful for training models on collaborative problem solving or exploratory dialogue. filtering is a challenge but definitely solvable with current tools.
Indexes trillions of messages and refuses to delete any of them and comply with GDPR. Deleting your account DOES NOT delete your messages, they remain on the platform for an indefinite period of time. The only way to get them to delete your messages is to go through this process (https://discordomicon.github.io/removal/overview/) and you're still likely to go through several support tickets before they comply with your request.
Tldr: they used a single massive elasticsearch cluster.
Now, they are using multiple elasticsearch cluster, running in k8s.
And redis has been replaced by pubsub (GCP).
Since sounds like expensives design but ok, I guess