My wife and I were just talking about this the other day.
I’m not in IT but I work as an industrial maintenance electrician, and knowing how computers work solves more problems than people realize!

It’s only because they were default subs. A while back one of the news subs (r/world news? ) got flooded with porn and basically switched to a random anime porn type of sub. That caused the population to migrate to r/anime_titties for all their news needs. Now when it happens to a special sub though it’s a problem?