Places that only exist for apps: store nominations, in-app events, public betas and app communities.
Let people sign up on your Play listing before release. They get notified, and can auto-install, on launch day.
This one lives inside the store or an app community, so it only applies to apps. In the workspace, Groivo gives Google Play pre-registration its own App Store campaign link (ct=) and Google Play referrer, so downloads from it show up in App Store Connect and Play Console.