Here is the problem with speculative thinking about extraterrestrial life as well as about the origin of life.
From time to time a storm arises in the virosphere and affects humans.
It’s an uninhabited, inhospitable place where hopes die for life by chance.
It’s important to remember that Darwinian factors are indeed real and can have important medical effects, but they only modify life around the edges.
Information is the stuff of life. Not limited to DNA, information is found in most biomolecules in living cells.