I guess you mean different things like i2p, freenet, hidden tor servers, and things like this? If so while there is content there and maybe there are up to 100,000 users (probably less than 5,000 are active) or so it pales in comparison to the regular Internet. Darkmarket wasn't very big in comparison either. It was just a forum.
https://en.wikipedia.org/wiki/DarkMarket
I think maybe you more mean this:
https://en.wikipedia.org/wiki/Deep_Web
And there are a considerable amount of pages like that. Think of all the forums who require you to log in prior to viewing posts or newspaper paywalls. Also increasingly Google isn't going to be able to index everything even if it is open to the indexing bots. That 97% of content is the so-called "Deep Web" is hard to believe though. I would be amazed if it were anywhere near that. But this quote from Wikipedia suggests that:
Quote:
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As of 2001, the deep Web was several orders of magnitude larger than the surface Web.[7]
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Interesting.