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How does this package differ from using something like the uri_links package, which provides methods to handle deep links via streams and initial links? Or i’m missing something?

That's a different thing. The code snippet is not about retrieving the deeplink, but the referrer link. So e.g. if you open "example[.]com" in your app from a Google search, you'll get a link to the Google search page (aka what the browser sets as referrer).

In the end this allows you to know from where your users are coming, not just which deeplinks they like to open the most

What about if it was launched from a deeplink in safari, but then needed to be installed from the store as a result of hitting the deeplink, and then the user didn't reopen the deeplink? Conversion funnels on mobile are so annoying to track.