The answer is most likely pesticides. Fungus is ancient. If a frog's immune system has been compromised it's probably susceptible to all manner of ailments.
Don't let the pesticide industry convince you their products are safe.
The same could be said about the black plague. Why haven’t we already evolved to be immune to these thugs by now? Yet somehow new diseases continue to emerge and kill millions.
Really the same could be said of all deadly diseases.
There actually is, if you click on the timestamp of a comment, you'll get a page dedicated to the comment where you can click "flag" to report it. You won't be able to add any reasons though.
Don't let the pesticide industry convince you their products are safe.