My two 'License type: Mobile - Expiration date: Lifetime' purchases in late 2018 and early 2019 for less than $20 each were a bargain made in paradise.
Wording should be ' activate any AdGuard product.' You can use any license to activate AdGuard on any of the operating systems - Windows, Mac, Android, or iOS' The KB is more specific: ' all types of licenses are universal. Just got around to noticing that the PURCAHSE link on the home page opens a singular, unique license.html page where the FAQ states, 'AdGuard license keys are universal and work on any device (Windows, MacOS, Android, iOS).'