No. Flat out no. There is no competition and they’re literally providing what they are capable of to take care of the others’ need. Mutual aid is not a marketplace and the fact you instinctually thought of it that way tells me you need a book on capitalist realism.
Not all competition is mediated via markets. Mushrooms will compete by injecting themselves into their adversaries using their own internal pressure.
Yeha, but they are showing an instance of nature in which things work one way and ask "why can’t humans XYZ if even a mushroom can? ", but there are also plenty of instances in which nature is savage.
There is a constant war in the roots of trees, does that mean humans should be in constant war?
Plus, there IS a profit incentive. Those mushrooms are trading. What they get in return is the profit incentive.
Where in that response did you see the word capitalism. Economics exist outside of your agenda/baggage.