This question evaluates a data scientist's competency in product analytics, experiment design, causal inference under network effects, metric selection (primary, secondary, guardrails), and interpretation of quantitative go/no-go criteria.

You are assessing the launch of a Group Video feature on a social media platform. The feature allows multiple users to participate in the same video call. You need to determine whether the feature is successful.
Assume:
Discuss the following:
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