I think your fundamental misunderstanding is how many people just scroll, lurk and at most comment. Let's call those passive users. They are many and therefore worth catering to. Reddit, especially the big subreddits, are engagement generators. Their point is not to answer the questions that you as an individual might have. Their point is to maximize engagement. Providing the kind of content that keeps thousands of passive users engaged in the app has more monetary value than letting you as an individual post your personal question. So it's geared towards letting users with a solid track record of creating engagement post easily, while being careful with users who don't have that track record.
You can see this in supermarkets too. Hundred different types of sweets but if I simply want nuts roasted without oil, I'm out of luck? Why? Because there's orders of magnitude more people who will buy stuff without reading the ingredients. The people who care about not having oil added to their nuts are so relatively few that they're not worth catering to by a mass-appealing supermarket.
At least those are my theories, not that I have any inside knowledge.
There's this Norwegian metal band called Kvelertak and I absolutely love their sound, but have no idea what the lyrics are about as I don't speak the language.