Lead Edge Capital's Mitchell Green: software is not "going to zero": "What people fundamentally get wrong is that they think R&D is the most important thing in these companies. It hasn't been for decades." "Open‑source software is a big industry. Grafana, Databricks, Elastic, HashiCorp, Red Hat — there are 20 more of them. You can get that stuff for free." "The reason enterprises pay for it is they need somebody to deal with customer support, security patches, and user authentication. This…