How do I know dead internet theory isn't correct?

It would seem trivial for all of my social media to be taken over by bots. In fact it would be trivial to believe that the internet I believe to be trud is just an illusion. What if Google isn't the biggest search engine but only the search engine that indexes the sunset of the internet for idiots for example? How would I know. It's "the matrix" but for the internet. How do I know Hacker News isn't entirely made by bots?