I suggest another point of view: why companies like Reddit, but also Twitter, do exists? Does ads ONLY justify the invested amount of money? I bet anyone will

I suggest another point of view: why companies like Reddit, but also Twitter, do exists? Does ads ONLY justify the invested amount of money? I bet anyone will answer: "surely not!" and than the point: why we do not came back to Usenet quickly instead of keeping up such services who happen to be unbalanced in usefulness terms?