I missed this when it was launched and it's very interesting to see your rationale. If you ever want a chat some time get in touch, I'm working on https://opentechcalendar.co.uk/
My ulterior motive is to ask you to add open data feeds for basic group and event listing information to your site - a free and open API and standard formats like ICAL (Just listings information about the next event, not private info like members names). I would never encourage event organisers to use a platform that didn't do this, as then their data is essentially being held hostage and it's hard for them to spread their information around to other places.