Give them a reason to care : hosting series they want to watch but don’t have access to, easier ways to share images and data (close relative works part time in an enterprise that banned emails from non corporate addresses, she used to send the photos she needs for work to her work laptop through email, it’s the reason she uses Immich now) hosting banned movies, inaccessible old movies or any thing that may peek interest gets their finger in the cogs. Key aspect is : initial access must be EASY (an app launcher is often all that should be required)