About Android server license

In my understanding, the license cannot be used on a non-android server if I switched to other types of devices later. Is that correct?

#2

The reason I'm asking this question is the licensing of Android server seems changed recently. At least in the past I could use one device without a license.
Today I got this error message "this server trial has expired, please purchase a license to continue using".

Just want to make sure I know the right type of license before the purchase is made.

#3

Yes the android license only works on Android