Not sure but that sounds like you have a problem with your Git installation (or a dependency of Git). Maybe a reinstallation can solve that.

I understand the “why would I pay for this” reaction. I think crowdsourcing is a better approach for these kinds of content. Once you reach certain level of financial commitment from the crowd, you can give away the PDF and sell the print copy.

git branches are just homeomorphic endofunctors mapping submanifolds of a Hilbert space

Yeah, once you realize that everything falls into place.

The shape of that bottle is creepier than the text.

I believe you can replace start with the command that is suitable for your system (e.g., xdg-open for linux).

That’s an unnecessarily strong reaction. Money clearly matters for some things. But that’s not all that matters. There are many people releasing FOSS without any financial expectations. Clearly, money doesn’t matter to those people on that context. Trying to argue that “money should matter also for those people on that context” doesn’t make too much sense to me. Nobody is forcing anybody to release FOSS.

Sorry, I don’t follow your reasoning. Why would a company not making money be a relevant problem for the advocates of FOSS? FOSS is about freedom. It never had an opinion about money. Money has always been irrelevant. Some people may not like it, and they are free to not use non-free licenses. And FOSS advocates will warn users about that (as they did in the past). FOSS doesn’t have an obligation to offer a solution to every problem in the software industry.

I don’t think that is relevant from author’s (and OSI’s) point of view.

Here is my understanding of author’s position: Stay away from companies like Redis and ElasticSearch. They are building software with a proprietary mindset (the fact that they have tight control over product strategy and development demonstrates this) only to realize that they are being devoured by bigger fish. It’s a business model problem, not an open source problem.