You keep posting this and it's not correct.
The first four chapters of the game are free (like a demo) but anything after that requires you to pay a fixed price of $10. That's a purchase.
In fact it's listed in my library as a purchase
"Thank you for purchasing Projekt: Passion by Classy_Lemon.
You purchased the game on 2023-08-07 01:00:21 for $10.00..."
Once you pay the $10 all versions of the game and future updates are available.
That's perfectly fine for Classy to do and I support him but it is a purchase. I'm not sure why you keep telling everyone it's not.