It doesn’t matter what the app intends to do. You should not under any circumstances identify mushrooms without loudly and clearly spelling out specific dangers.
It would probably be wise to do so, especially after you've learned that it could save lives. But to decide after the fact that it's criminal negligence is not a healthy outcome. I'm all for trying to make sure people don't hurt themselves, but the app makers should not be legally responsible for the decision that was made here, period.
