Yes, FR24 push updates, so fr24feed updates without user knowing it.
This piece of code in their file /usr/lib/fr24/install_dump1090.sh causes the change of autostart from yes to no:
if grep -q 'START_DUMP1090="yes"' /etc/default/dump1090-mutability ; then
sed -i 's/START_DUMP1090="yes"/START_DUMP1090="no"/g' /etc/default/dump1090-mutability
systemctl stop dump1090-mutability || true
fi
To prevent fr24feed from repeatedly changing autostart from “yes” to “no”, get rid of this file
sudo rm /usr/lib/fr24/install_dump1090.sh