[bistro]

I don't know. I suspect most software is actually internal or proprietary. I don't think that developpers working on some custom widgets factory optimization software actually use it to optimize their mini-factory at home. Or that many developers run their own telecom on the side and need all kinds of software to route calls. Same is probably true of FAANG developpers too: how many adwords engineers actually run their own advertising campaign? Or have a personal need to store massive amounts of data in their own bigtable?