If I have Minecraft on Windows 10, can i get it for free on Mobile (Android)
Solution 1:
No, the Android version of Minecraft cannot currently be obtained for free with a Windows 10 version of the game.
There used to be a promotion for owners of Minecraft: Java Edition though:
Players who have purchased Minecraft: Java Edition before October 19th, 2018 can get Minecraft for Windows 10 for free by visiting their Mojang account.