What's New on Fire TV
"Auto Offload" feature to optimized device storage comes to Fire TV
Here's how it works. If your device is low on storage, Auto Offload will partially remove some apps that haven't been used on the device in the last 60 days without deleting your login credentials. When you want to use an offloaded app later, the app will be reinstalled for you along with restoring your log in credentials for that app, just like it was never removed.
This setting is automatically enabled. To disable it, go to Settings > My Fire TV > About > Storage > Auto Offload > On/Off.
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This is kind of how Roku does it. Except Roku doesn't wait 60 days. It seems only the most recent apps are loaded into memory and the majority are installed from the cloud when needed.
Let's see. The last time I checked, I had somewhere between 400 MB and 500 MB free. Let's see how much I have now... It's taking a little while to get into Settings. Go to My Fire TV, About, I currently have 469 MB of 5.28 GB available. Let's see if this goes higher over time.