We ( http://www.opencagedata.com ) are sending such updates. Only 3-4 metrics, less blog articles and more open thinking about future plans, priorities, conferences we attend. 6-8 paragraphs. We ask for feedback but at the same time stress that it's optional. We get praise for being open, honest, on-time (once per month) and even send updates if there isn't anything new. We're self-funded so strictly we don't have to…
Off topic, but is there a technical reason to limit the Large package to 15 requests/sec ? Multiply that with the number of seconds in a day, and you'd go over your limit of 1M/day less than 30%. Even with minor fluctuation in traffic, you'll have dropped requests.
one of the co-founders here. If this is keeping you from becoming a large customer let's chat, happy to find a solution for you. Please ping em via the contact form on the site