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This is another. Not sure if raising money in itself is a red flag. https://www.crunchbase.com/organization/argo-ai#/entity

This--plus there is some evidence that suggests Uber already negotiated to acquire Otto before it even came into existence.

Google spent $1600M on a 18-months old company.

Youtube starts in April 2005. Is bought by Google October 2006.

By that point "the site delivered an average of 100 million video views per day". Otto never delivered anything.