Will Branch still be able to offer deterministic deep link matching on iOS?

We will no longer be able to deliver deterministic matches on iOS for the first install. Deterministic matching will continue working for deep links into an app that is already installed.

However, the Branch system uses an industry-unique, anonymous, probabilistic algorithm that incorporates historical attributions to deliver high accuracy data where there is no universal ID. This means you'll still get the highest accuracy available, which should be more than sufficient for anything outside of highly-secure use cases like auto-login.