Instant apps aren't installed, per se. They don't have homescreen icons, can't send notifications, access protected data, run background services, etc. However

Instant apps aren't installed, per se. They don't have homescreen icons, can't send notifications, access protected data, run background services, etc. However if you have an app that has a rich interface for some need, Google slices off the pertinent parts and can serve it up transparently.