Evaluating only Marble’s profile at its peak — without knowing the outcome — the model ranked Unit economics as the #1 likely cause. Documented cause: Regulation.
Key Events Timeline
FOUNDING
Marble founded in San Francisco to build last-mile sidewalk delivery robots.
PRODUCT LAUNCH
Launched pilot delivery program with Yelp Eat24 in SF neighborhoods.
REGULATORY ACTION
SF Board of Supervisors passed ordinance capping delivery robot permits at 3 per company citywide.
SHUTDOWN
Marble quietly ceased operations after failing to secure Series A and expand beyond SF pilot.
Full Analysis
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Documented cause
Marble built sidewalk delivery robots piloted in San Francisco starting 2017, but faced relentless regulatory pushback from SF Board of Supervisors who capped permits to 3 robots per company in 2017. Hardware unit economics never worked at small scale. After raising ~$15M, the company quietly shut down in mid-2019, unable to scale past pilot programs or secure further funding.
Lesson
“Pilot a delivery robot only in cities with clear regulatory frameworks, not activist ones.”