If this is the case, could a jailbreak provide a free remedy?

Hello, no I do not have an Apple Developer license. I also just want to have an app on my iPhone that is only available to me. Because it contains personal data that only concerns me (password etc.). I've heard that I have to buy a €100 license for this, but I can't quite believe that I have to spend so much money every year. As the app doesn't earn me any money and is only an aid for my self-built SmartHome. I hope Apple is not serious about this....

Okay it was not a Week, after four days the app was expired……

Hey, thanks for your message. Yes, I do that when I develop the app, but it is no longer available after a few days. "This app is currently no longer available" or so....