qBittorrent official forums

Hi all. I checked

~/.kde/Autostart
~/.kde/share/autostart
~/.config/autostart
~/.local/share/autostart
/usr/share/autostart

But found no mention of qBittorrent. What is responsible for autostarting at system startup?

What's your OS? With GUI or NOX version?
Any systemd unit enabled at startup?

First check your distribution autostart options, then the way/guide you used to install QBT
With a regular apt-get it doesn't start automatically following my experience.