Non conosco le regole di Appium, o se è pertinente a questa domanda, ma non hai bisogno di un account sviluppatore a pagamento per provare su un dispositivo reale. Puoi sviluppare app e distribuirle sul tuo dispositivo reale, ad esempio, senza pagare Apple.
È necessario un account a pagamento solo se si desidera l'app nell'App Store o distribuita in qualsiasi programma aziendale.)
Per Apple :
If you’re looking to develop apps for Apple platforms, download the
Xcode developer tools, SDKs, and resources for free on the downloads
page. Program membership is not required. If you don’t already
have an Apple ID, you can create one here.
Apple Developer Program.
If you’re an individual or sole proprietor/single person business interested in creating apps for distribution on the App Store
for iPhone, iPad, Mac, and Apple Watch, enroll in the Apple Developer
Program. Membership includes access to beta OS releases, advanced app
capabilities, and tools to develop, test, and distribute apps and
Safari extensions. Developers enrolled as individuals will sell apps
on the App Store using their personal name.