BTW, Nanite Detonators seem to be doing OK in my sim, they are not growing fast, but at least they are not dying... They are managing to get by...
My 2.2 version wipes out everything I put it against in my sim, but as far as I can tell from the internet population thing, they aren't doing well anywhere else.
I even started a sim up with nothing but seasnake 1.2 and algae minimalis, waited until the seasnakes were dominant and swimming around with 6 or so bots per snake, and then introduced a few nanite detonators, which proceeded to spread and eventually take over the sim (There are about 67 seasnake bots left, in the upper-left and lower-left corner of the sim. There were 80-something the last time the graph updated before that).
What conditions are y'all using in your sims? (I'm using standard F1 conditions, I think)
Edit: Though after they reach 1000 bots of the same species in the sim, they mostly just sit there and do nothing. (Putting most of their energy into body)