Yes it does appear that Tinder is doing something different. You can not create a new account using SIWA you can only login to an existing one. If you try you will get an error saying the account does not exist and you have to create one the standard way with email/password.
I thought it was not possible to present the Existing Credentials sheet manually and it would only be displayed if the user already used SIWA in the app previously.
raso
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Pattern suggestion: Similar to probableWebURL but only for URLs that match the apps associated domains.
Some apps will copy a universal link from a developers website to the clipboard before sending a user to the app store to have the user install the app. On first run the app will check the pasteboard for the universal link and take the user to the matching "page" in app. In this case the app only really needs the pasteboard for URLs from its associated domain list.
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