That's how!

А вот, как!

As my project is already profitable for me because it's a commercial order from my university and it has no major inventive things, I don't see any reasons to prevent other people from making stuff like I did and make their own profits. So, I'll leave my content on creative commons attribution share alike license (CC BY-SA) which means that somebody who will for some weird reason use my work as a basis for their own will have to make a refrence for me as an author and also share his/her work on the same conditions. Basically it means that I make my own competitiors, yet, as I already have some more experience in making my project, I'd probably be more demanded than them. You can read more about licenses here