Self driving cars could actually be kind of a good stepping stone to better public transit while making more efficient use of existing roadways. You hit a button to request a car, it drives you to wherever, you need to go, and then gets tasked to pick up the next person. Where you used to need 10 cars for 10 people, you now need one.
I think it depends on the project. Some projects are the author’s personal tools that they’ve put online in the off-chance it will be useful to others, not projects they are really trying to promote.
I don’t think we should expect that authors of repos go too out of their way in those cases as the alternative would just be not to publish them at all.