Lets say you want to buy an app. Specifically Super Monkey Ball 2 which is no longer sold because it is unsupported by newer versions of android.
The game runs great in newer versions of android.
You just can't buy the game anymore.
Here are the games by Sega and there's no Super Monkey Ball.
So, you can't buy the game if you wanted to!
So, is it illegal to get the game in an unauthorized way since the game has been abandoned by the copyright holder?