What would your longer-term plan be for the free tier? If it doesn't eventually turn into revenue, it doesn't make sense to support. And Disqus seems to think the only way to monetize the free piece is through lots of tracking and ads.
I want to limit the number of free tier users to ensure that the cost of servers+support of free tier users is a small fraction of revenue. Since the backend does not do much beyond just serving comments and reordering the comments tree, it's pretty lean.
> If it doesn't eventually turn into revenue, it doesn't make sense to support.