Cathallina Free Font is licensed as Freeware, commercial use requires donation, which means it is free for personal use only. If you want to use it commercially, you will have to purchase a license or contact Under21.

This font is 100% free and can be used for commercial purposes

however,
We will be very happy if you want to buy us a cup of coffee :D here:
https://www.paypal.com/paypalme2/panjiriz

we also have several paid fonts which you can see here:
https://graphicriver.net/user/under21studio/portfolio