That’s a category of solutions to the Fermi paradox, but it requires uniformity of motive inside a species (no-one will want to expand) and between species (all species will stay put). I’ve addressed these issues at the end of: https://www.youtube.com/watch?v=mrUWkfeJABY&list=UU_qqMD08PFrDfPREoBEL6IQ
That’s a category of solutions to the Fermi paradox, but it requires uniformity of motive inside a species (no-one will want to expand) and between species (all species will stay put). I’ve addressed these issues at the end of: https://www.youtube.com/watch?v=mrUWkfeJABY&list=UU_qqMD08PFrDfPREoBEL6IQ