There are people who oppose, say, GMO, because they are afraid of possible harm the technology can bring.
Using the fungi seems to be legal to me, so why are no companies making money with it? Or are they?
Yes, it is already marketed. However, the caution arises from the fact that if you add fungi that favor certain plants over other plants, and let them reproduce, you might drive ecosystem dynamics away from stability (something like that).
This is a place for matchmaking researchers with research ideas in applied sciences that have a sizeable impact on human condition.
Edit: let there be janitors.
What are the so-called adult problems in your field and who, in your opinion, is needed most to solve them?
Add reasons why you are not working on them yourself. (I, for example, am in a PhD program very remote from practical applications and might have a chance to do some research on useful stuff if I survive that long.)