That’s not obvious at all…
Maybe it is to people who are really deep into the Linux world but generally if there’s only a single person in the world doing something, it’s never obvious that someone else will start to do that if the first person stops.
I don’t know enough to be able to say how easy it is to take over, but having been done by a single person could mean that no one else has the skills or the interest to do it, or maybe to do it as well as the original person.
I can definitely see why it could make a Linux user worried.