By the “sewage” analogy you are expressing the assumption that the vast majority of what people write is outright toxic and that being exposed to it is actively hurtful.
My experience on the internet does not reflect this, this is a very pessimistic view of people, bordering on perl-clutching.
Most raw user generated feeds are not great sure, but it’s mostly mediocre jokes and mildly provocative takes from bored trolls, and that’s usually a loud minority. Most people either lurk or make a modest effort now and then, particularly in niche communities like this where most people aware of it will already be fairly deeply immersed in tech. People have better things to do than to constantly be aggressively offensive, I imagine it gets old fast, and you really need to go out of your way to write something that legitimately hurts an adult.
Sure of course there are corners that are cesspits of hate, but they tend to band together and it is quite hard to bump into them accidentally. And when you do, you just feel slightly disgusted for a second, turn back and forget about it.
Some moderation is critical, but it usually needs to only be enforced for a few bad apples, most people act with decency and common sense, even when anonymous. And yes including people with lesser means and/or from shitty countries. People from different cultures are mostly the same when you peal away superficial customs, and I find much more in common with someone of my age with similar interests from the other side of the world, than with a grumpy old neighbor frankly. At least that’s my experience.