A correction - the price of Rs.69,900 is for the iPhone 13 mini. The iPhone 13 is listed at Rs.79,900 in the Indian Apple store (~$1,050 against $799 in the USA).
I wanted to integrate your project in another open source project that I was contemplating of working on. However, the licensing bit made me think twice about that. While I could see that under the terms of GPL I could easily remove the code that checks for the license, and that the code was not hidden or obfuscated in any way, but at the same time it just felt against the spirit of the project to do so for anything other than purely personal use. Hence I am evaluating other projects for my use case.
I think this approach of dual licensing is well suited when the intent is to let people audit source code freely for evaluation or personal use purposes, but then pay up when they wish to use it in their public/commercial projects.