I wonder if those wandering black holes have consumed things like extraterrestrials spaceships?

This is an interesting thought, a very interesting one; but I guess we will never know.

What really concerns me is that a wandering black hole has been found in our Milky Way galaxy, this might be a much larger concern for future generation i.e after they confront the challenge of finding a sustainable and habitable planet. Or find a way to successfully manage Earth and all the challenges it is currently faced with.

Many thanks for your constructive feedback!