Earlier quoted context omitted.
I agree with you in theory, but in practice someone has to pay for all this magic.
We did. As in we, the Internet, existed for a long time without anyone making money and we paid for the privilege. Websites were built and hosted at owner's expense, for years, with no expectation that they be financially rewarded. Sure some would run donation drives, or work with sponsors relevant to the community in question, but a whole ton, mine included, just cost me a lot of money over many years. Those website…
Popular websites that allow user content to be uploaded or linked do cost that much to run, due to content moderation.
There might be a small (relatively) forum here and there that a few good moderators are willing to slave away at keeping clean, but you will never see a website that allows user content with as many users as Reddit/Youtube/Instagram/etc be cheap.
Although, due to AI, the cost to spam the small forums might be so small that even they might come into the crosshairs.