

The system is still “PC” in this case, even if technically the platform is different. And since you have to log into your account with their service, they can easily confirm that you own the game.
I don’t have to create an account to play Slay the Spire on Android.
Only if you have a sign posted, reading “All ye who enter here forfeit thine selves – body, mind, spirit, and soul – to the owner of these lands, until such time as ye leave or are slain,” with the sign carved from stone by hand, with a willowbark dagger, blessed under the light of a blood moon, approximately eight feet tall, flanked by two shrubberies – that look nice and are not too expensive – and visible to all who enter, lit eternal by the captured light of the new moon.