One day, it is possible I will see one of those memes of a symbiont pair sharing resources with the "yo why are they doing this if there's no profit incentive" caption without the urge to kill rising, but it is not this day.

(Spoiler alert: they are both profiting from the relationship. That's what makes it mutualism - i.e., what the popular meaning of symbiosis is assumed to be - and not parasitism and provides the evolutionary incentive for them to do it. Idiots.)