It's a bit of an inappropriate comparison though, since restaurants are ubiquitous and reasonable GitHub alternatives are vanishingly rare. People are quite rightly more troubled when providers in a low-cardinality space become unviable.
You can literally take the exact same software that Codeberg uses, Forgejo, and stand up your own alternative with different policies, with the only real cost being operational in nature. It seems less the case that it's a "low-cardinality space", and more that people feel entitled to other people's labour under their own terms.
What is a "reasonable GitHub alternative" exactly?