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needs to be verified
By default, a user can see all started processes from other users, which is bad, but also their start parameters, which is pretty dangerous. Those start parameters can contain sensitive information, such as RCON password, Steam API keys and GSLT upon start, a Rust dedicated server is checking if the process name started by any user, and will prevent you from running it again if it finds it, displaying "Player is already running".
To avoid that, run:
mount -o remount,rw,hidepid=2 /proc
And to keep the changes upon machine reboot:
# Here are the modification to apply to the "proc" line
proc /proc proc defaults,hidepid=2 0 0