I'm not a forager in any sense, but my understanding is that if you want to forage for wild mushrooms, you have to work directly with someone who is already experienced, and not just read books - even if those books are legitimate.
Amazon is definitely the one behind this. This is all part of their “vertical integration” bullshit I bet. They’ve been taking tons of money off the top for years. Where to go besides taking 100% of the money?
There was an image that had instructions for "making crystals" years ago. If you followed the instructions you'd end up making mustard gas or something, instead of any kind of crystals.