About four years ago, Jan Harley led an investment running to tens of millions of euro in Instacart for Unilever Ventures, the venture capital arm of the consumer goods giant where he worked at the time. The grocery delivery business was a unicorn but only just. By March 2021, Instacart was worth $39 billion. Its valuation doubled repeatedly as millions of consumers in North America started using its services during Covid-19. Instacart is now hotly tipped for a potential IPO and is being advised by Goldman Sachs. While not quite at the level of the Collison brothers’ Stripe or Elon…