A while back a wee lizard whose granny was a fish had a purpose, then it became a rat like thing, then a chimp like thing then us A path, but at each stage they had a purpose, they were part of an ecosystem and shared in the (changing) eco system, whether to be eaten, eat or something else. I think we are at cross purposes really, I kinda think?
Yes, a way to think here (sideways) is you can program dna to transform e.coli into ethanol in a computer, the output being not a new species, but a copy of an existing thing, So where does life evolve from, a tree grows, a species splits and part of it feeds on the tree, the others find the tree poison, a new species is born. So it’s this kind of thinking, we can create stuff that has a purpose (the ethonol wants to do what all ethonol does, whatever that is) as part of the eco system. With enough planning then we can do amazing things.
What I mean with safe is that it is autonomous, so a node is almost useless (like a cell) until they join up (their purpose is to join and create something). Nodes are very similar then groups like molecules grow into bigger more useful parts (in terms of the whole picture). A normal computer program is on a bit of tin we create and can fully manipulate like pay dough. Left alone it just repeats (with exception of some AI).
Here we do not propose advanced AI, but more a lizard or cell, it has a purpose, it will evolve, but at it’s core it’s already different as it’s not only got a purpose it actually works to fulfil by interacting with us humans (farmers etc.) but the interesting part is that it’s in bits spread about the planet (hopefully) so is unique in it’s properties. It’s the fact these properties are encoded into it that is interesting. This is important.
[EDIT] Maybe to add evolution does create things that are useless or more accurately do not fit a purpose properly, these are the evolutionary failures and important to evolution. Maybe that’s a better answer, I don’t know, but evolution does create stuff that does not work. To me the current Internet (web really) is an evolutionary end and now should evolve, or die. A better example of the lizard perhaps, it will evolve and when it does the old one will have no purpose, except a place in the evolutionary chain.