I do not have an example for this, but the most ridiculous argument for open source software (at lease for most people) has always been that if the software has a bug you could simply fix it yourself. Funny enough this has actually become kind of true with new LLMs.
Did you not fix bugs in the oss you run, pre-LLM? Or not bugs, just your own changes? Being able to just grab the source and tweak it without needing to try to RE or wait around or convince the owners/developers to do something I wanted to happen was one of the biggest selling points.