Thanks for the feedback. The idea is show their monthly progress with the growth numbers but also linking to the founders' revenue reports (see "INCOME REPORTS" section on their profiles) . Most of them are already detailing very well "how they are doing" on a monthly basis, so I rather have a monthly update than one time interview. For example, BugMuncher's founder described "how he did it" on his series of (19 so far!) blog posts http://www.transparentstartups.com/startups/bugmuncher (clicking on the link for each month goes to their blog reports). So every month, the founder will be able to add the new revenue figures as well as linking to the new report, keeping Transparent Startups as the place where you can follow the growth of these business month by month.
Agreed! From tomorrow, 1st October, founders will start publishing their September business figures and reports. I think they're going to be much better than August numbers.
In addition, I believe there a few sites already about interviews for entrepreneurs, including podcasts. However I don't think is there any site that collects all the startups that are transparent, that's it, showing revenue numbers and growth journeys.
There are some sites that collects stats and income reports from Bloggers, like https://getpostcookie.com/income-index/, but I wanted to focus on Tech Startups with real SaaS products or exceptional services.