Related: How to enable telemetry on KDE
pkgstats is a great way to help the Arch Linux packagers figure out which packages are being used by ((people who enable telemetry)). You can see some cool results of it here: https://pkgstats.archlinux.de/fun
Similarly if you use the AUR a lot, check out aur-auto-vote
Exactly, I’ve always liked the way Debian does it, asking during the install process if you want to participate. It’s more obvious that way, I didn’t even know Arch had this option.