The thing you getting wrong is if you go to /r/technology you are only seeing one subreddit on Reddit. It is not all Technology forums on the internet nor is it even all the Tech stuff on Reddit. You never see it all. The world is big, you never will. You just though you were because Reddit is well known, and the Technology sub-reddit is well known to you. You made a choice just to use that subreddit still and Reddit has no interest in federating with other sites. At least on the Fediverse you can see most things on the Fediverse if you choose.