As a junior biologist, I remember having the realization that viruses and other quasi-living things are just an epi-phenomenon of life. That was a level-up moment in my training, a lot of things clicked into place.
Meaning, if one could magically remove all viruses from the biosphere, they would re-evolve very quickly. Let alone the fact there are significant numbers of viral fragments in our DNA, some of which have been co-opted and used for crucial purposes, such as the mammalian placenta.
Plus the tendency of some of those fragments to move around the genome, providing a source of variation that is sometimes selected for.
Viruses and maybe this archaea may not meet a binary definition of ‘life’, but any biosphere anywhere in the universe will have things like them in great abundance. Any evolving system will produce them.