It is a mystery
Tory Lanez Stan
We have:
- the internet, a GOAT source of information
- more organized libaries that can deliver you books from other cities
- More peer-reviewed acedmic resources than ever

It wasn't like that at all back in the day. I think you're forgetting that the vast majority of the people whose stories and biographies exist in the modern consciousness were either incredibly wealthy or incredibly accomplished. Not to mention there were an incredible amount of charlatans back in that day. 
