I've noticed that all* bluetooth devices I've scanned are stored forever in /var/lib/bluetooth/<adapter>/cache folder.
This cache folder is never cleared and contains all information such as Device Name and collection of services & characteristics my Chromebook has seen while scanning/interacting.

According to Bluez folks, "this is by design, this is to speed up things like showing the actual name of devices in the discovery, if that becomes a problem you can mount it with tmpfs and cleanup on every reboot."

I wonder if we should have a daemon that could clean this folder.