Your members has indeed come a long way. I was the developer who took it from an abandoned Greek guys awful code to something saleable. I stopped working on it a couple of years ago and Tim Nash, the guy who made all of this happen, had a new team in place and continued the project thereafter. Tim saw something, a problem and some guys using the old plugin and decided to do something about it. We had an excellent community driven plugin and at the peak we were doing several bleeding edge releases a week. It's one if the things that made the plugin so successful but was also one of the pitfalls in that as we bolted on more functionality based on forum requests and custom paid jobs the code base for worse. I believe an attempt to refactor was made around version 10 but even so as Tim suggests in his quote above it would take months to rewrite or refactor. I might have a look myself at some point and an certainly willing to be part of a group if anyone picks it up properly. I think anyone who currently uses S2 member for a simple free plugin should seriously consider using Your Members as it's easier to use in my eyes and with the new license will be easier than ever to extend. I suspect Tim and the team are open to custom work as ever and support via the GitHub community etc. hats off to the team.. A commendable way to close their doors.

Thanks
Sean Barton