I would say that most people foraging wild plants in western societies aren’t doing it to sustain themselves. It is usually has to do with learning more about their surroundings, to revive old knowledge or for fun. And as long as you double check, play close attention to detail and most importantly don’t blindly follow an app you should be completely fine with this. (Well, foraging plants from the Apiaceae (the carrot family) is not really a good idea due to the close resemblance of most of its members.)
Yeah, I guess there are two sides to the problem here. People that do fraught on a level that is hard to perceive and those that do fraught on a grandiose level. I agree with all of your comments, especially what you say about how the harder to perceive fraught is actually more damaging to science.
But I guess the question initially posed why some people would do these high risk frauds. Why would someone say they’ve got a working room temp/low pressure supercomputer? Why would someone say they’re able to turn anything into gold? As you say, these are just some spectacular outliers though. And some people are just in it for the short time of grandiosity and fame and don’t care about the consequences I guess?