Comment by Hackbraten

Back then, many programmers originally learned their ropes in an 8-bit home computer era (or earlier), where it used to be completely normal and even necessary that you used whatever memory region you got away with.

For example, on the C64, you would get away with using the memory locations $02, $2A, $52, $FB to $FE, $02A7 to $02FF, and $0313 as scratch space for your own programs. Memory was incredibly scarce. I can’t blame programmers for sticking with their habits and for taking several years to unlearn and adjust their misconceptions about who owns what if they came from a home computer era where that pattern used to be the only way to get stuff done.