Why doesn't this startup exist yet?

I happened upon this [1] story about AVG on reddit about how the anti virus software has just updated their privacy policy. They now can and will sell your browsing history to 3rd parties. This isn't the only software that sells user data. And they make a ton of money from it.

I'm just wondering why there isn't a startup that cuts out the middleman and lets people sell their browser history directly?

https://np.reddit.com/r/privacy/comments/3l4apg/avg_anti_virus_just_updated_there_privacy_policy/