Which metric is considered the most reliable indicator of long-term success for a newly launched mathematics learning software product?

The educational mathematics software market has seen remarkable growth in recent years, with numerous product launches targeting different segments of learners. Companies use various metrics to determine the success of these launches. This poll tests your knowledge about how mathematical software companies measure product launch success in today's data-driven market.

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First-month download volume
User-generated content creation rate (problems solved, theorems proven)
Initial press coverage sentiment score
Number of educational institutions adopting in first quarter