https://softwareengineering.stackexchange.com/questions/386194/why-do-we-still-grow-the-stack-backwards

TL;DR: For historical reasons stacks growing down is defined in hardware on some CPUs (notably x86). On other CPUs like some ARM chips for example you (or more likely your compiler's developer) can technically choose which direction stacks go but not conforming to the historical standard is the choice of a madman.