mybinder.org has served millions of scientific python users for 8 years now! It is an experiment in running open source infrastructure as a public good. Sustainability challenges faced by open source software production are magnified here - we need people time to manage the infrastructure, pay for computational infrastructure required to run the service, operate it reliably by responding to outages in a timely fashion, and fight off abuse from malicious actors. This talk covers the lessons learnt over the years, and new community oriented experiments to better sustainability, functionality & reliability that we are trying out now.