My Unifi Cloud Key (the original one) had been broken for some years (not just the Micro-SD card: even with a fresh new card it would not boot), but I didn’t bother as my WiFi network was configured well enough.
But then I had to do some configurations and found out newer Cloud Key iterations have their issues well: batteries dying, hard-disks failing, you name it.
[Wayback/Archive] Unifi Network Controller replaced with Network Application ? | Ubiquiti Community
UI Marketing department decided to change the name. However, depending on the version you are on now, the new versions make a lot of changes to the UI as well as the operation of the APs.
Then I discovered you do not need to run it on either hardware or docker container (the latter I know because of [Wayback/Archive] Die wunderbare Welt von Isotopp), you can now also run it on various other host operating systems:
The Wiert Corner - irregular stream of stuff 