This is going to sound silly, but out of an abundance of caution...
I have grown pink oyster
mushrooms by buying spawn from a legit seeming vendor
online and injecting it into a bag of hardwood sawdust, letting the mycellium run, then fruit, and behold:
If you try to grow pink oyster mushrooms and get something that looks like this, I'm fairly confident that they are in fact pink oyster mushrooms. But since mushrooms can kill you, I want to ask if there is any way this could be anything else that could be dangerous.