It just works
Based on market validation, competitive moat, team risk, and execution feasibility at founding stage.
88/100. Dropbox solved a real pain (sync across devices) before iCloud existed. The referral program (250MB for inviting a friend) is still the most efficient growth hack in B2C SaaS history.
Referral loop was genius: give users 250MB for inviting friends. Storage is something everyone needs more of. Self-perpetuating viral loop without paid acquisition.
Long-term risk (which materialized): Apple ships iCloud with every iPhone. Google gives 15GB free. You need a moat beyond syncing. Dropbox found it in business use cases — but it took 10 years.
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