People don't realize that Reddit *used* to be open source. https://github.com/reddit-archive/reddit
Another thing people find surprising:
Self-hosted Reddit servers used to be commonplace.
Another thing people find surprising:
Self-hosted Reddit servers used to be commonplace.
Now imagine if ActivityPub existed when Reddit was open source.
Well, we don't have to imagine it. There's Lemmy.
But my point is that every self-hosted Reddit install could have been federated if ActivityPub existed back then.