It's worth noting sometimes when you install applications, they can set/override it. For instance I went looking for what set my value, Apparently Ryujinx can create this
➜ ~ sysctl -a | grep max_map_count
vm.max_map_count = 524288
➜ ~ rg 'max_map' -l --max-depth 4 /etc 2> /dev/null
/etc/sysctl.d/99-Ryujinx.conf
/etc/apparmor.d/abstractions/nvidia
➜ ~ cat /etc/sysctl.d/99-Ryujinx.conf
vm.max_map_count = 524288
vm.max_map_count = 524288
➜ ~ rg 'max_map' -l --max-depth 4 /etc 2> /dev/null
/etc/sysctl.d/99-Ryujinx.conf
/etc/apparmor.d/abstractions/nvidia
➜ ~ cat /etc/sysctl.d/99-Ryujinx.conf
vm.max_map_count = 524288
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