Short version: because Apple owns the gate.
On iOS, only Apple’s Screen Time system is allowed to put a shield over another app. Tollgate cannot dim your feed, block a launch, or draw so much as a pixel over another app on its own. Screen Time access is Apple’s mechanism for letting an app like Tollgate stand between you and your feed. Without it, there is no gate. That is the whole job.
Here is what granting it actually means:
No permission, no gate. The app will say so plainly on the permission screen and offer two ways forward: try the prompt again, or open iOS Settings and grant it there (Settings → Screen Time → Apps with Screen Time Access, or search for Tollgate in Settings). Tollgate notices the moment access is granted and arms the guard.
Apple’s system prompt is the same one used by parental control apps, so its wording can sound broader than what Tollgate does. Tollgate uses the individual mode, for your own phone only. It does not monitor family members, read web history, or report to anyone. What it does is exactly one thing: put a question between you and the next scroll.