This question evaluates a product manager's competency in login flow UX critique, feature improvement ideation, success-metric definition, and designing data privacy and integrity safeguards for a popular short-form video app, testing skills in product management and decision-making.

You are evaluating a widely used short‑form video app (TikTok). Assume standard mobile patterns (iOS/Android), common auth options (phone/email/SSO), and that users can browse some content before logging in.
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