I doubt you are doing it for good . First make your promise true . I do not understand why people should use your qr generator tool while there are already tonnes of links like :
GOQRIt's a project I wanted to do for myself, and now I made it with some old friends and I decided to publish it and see if people like it.
In a future, if donations reach like 10$ or so, I will buy a premium hosting and then maybe add some adds to the page, but for the moment, I prefer keeping it working only with donations and see if it is possible to improve the site.
Thanks for your interest!