Daemon packages usually include the relevant systemd unit file to start some packages even include different ones.More information is available in this forum thread. You can view the collected data at the Statistics page. The information is sent anonymously and cannot be used to identify you.
Please consider installing the pkgstats package, which provides a timer that sends a list of the packages installed on your system, along with the architecture and the mirrors you use, to the Arch Linux developers in order to help them prioritize their efforts and make the distribution even better.
