I personally relate with people (wannabe physicists) who want to do something BIG in Physics and Maths, but don't have a high level-level education (PhD) suited for it. Reasons could be a lack of jobs in pure science and the amount of time a PhD or postdoc takes.
When such people who truly love exploring and researching somehow end up doing something totally different as a job, they try to stick to studying science as their hobby. Many of these people later write research papers which they have produced themselves, targeting the big question-marks we have in science and try to get a review out of real physicist by sending them their work. But most of them (99%) are straight up wrong and miscalculated.
Why? How is the learning process for these people so different than the ones doing a PhD that their work is not even worth a real physicist's time? I mean they (wannabe physicists) must have also read tons of books for their research, they must have thought a lot, they must have gone through hundreds of research papers themselves, the only thing they might truly be lacking is seniors in the field to guide them; but I am sure many people doing PhDs also don't get that much guidance. So what might set them apart so drastically?