>Because an "unstoppable apex predator" could never become 100% Grey Goo, as it still needs something to eat! Grey Goo doesn't consume for energy but for mass;

>Because an "unstoppable apex predator" could never become 100% Grey Goo, as it still needs something to eat! Grey Goo doesn't consume for energy but for mass; energy needs are plot devices. I'd argue the majority of human food consumption is for energy not mass so we can't approach the 100% mass of a grey goo event.